OPINION
RABINOWITZ, Chief Justice.
The facts underlying the four criminal convictions appealed from in this case are not in dispute.
On January 6, 1978, members of various anti-abortion groups staged a nationwide protest. In conjunction with that movement, members of Alaska Right to Life staged a demonstration outside of the building housing the Alaska Hospital and the Alaska Clinic in Anchorage. Having decided that they had "tried everything else" and that it was necessary "to try ... peacefully to stop the taking of human life," appellants Head, Fardig, Sigfried and Cleveland entered the Alaska Clinic to conduct a more emphatic protest than the one in progress outside the building. Head and Siegfried proceeded to attach themselves to the door of the Clinic's operating room with handcuffs and chains, while Cleveland and Fardig handcuffed themselves to the operating table.
Shortly after appellants had established themselves in the Clinic, Mingo, the building security supervisor, asked them to leave and then, in response to their refusal, obtained a set of boltcutters. Mingo first cut the handcuffs connecting Head and Sig-fried to the door and escorted 'them from the building. He then returned and, overcoming relatively minor resistance, freed Fardig and Cleveland. Fardig was escorted outside and Cleveland, who refused to walk, was carried out on a sheet, All four were advised not to return unless they needed medical assistance.
Moments later, appellants re-entered the building and again approached the operating room; Mingo stopped them and again requested them to leave. Fardig, Cleveland and Siegfried then sat down on the floor, while Head removed himself to the building's main entrance and sat down there. At that point, city police were summoned. All four appellants were once again requested to leave the premises, and on refusing to do so, were arrested and then removed by police officers.
Appellants were each charged with violating Anchorage's criminal trespass ordi[1076]*1076nance 1 and all were convicted under that ordinance in the district court. The convictions were affirmed on appeal to the superi- or court, and are now before us on appeal from the superior court's affirmance.
Appellants' primary defense at trial was to have depended on the claim that their actions were necessary to avert imminent peril to human life. They allege error in the district court's refusal to instruct the jury on the defense of necessity. Although the trial court excluded that defense, it did allow appellants to defend on the ground that they acted under an honest and reasonable, but mistaken, belief that the necessity defense would protect them from criminal prosecution for their actions. They allege error on the ground that the instructions given on this latter defense were so "confusing and contradictory" as to require reversal. Appellants also seek reversal on the ground that the criminal complaints relied on by the state were defective and on the ground that the cumulative impact of the alleged erfors deprived them of their due process rights under the United States Constitution and the Alaska Constitution.
I.
DEFECTS IN THE COMPLAINTS.
Appellants argue that the criminal complaints in this case were defective in two respects. First, Fardig, Cleveland and Sigfried claim that they were arrested in the Alaska Clinic rather than the Alaska Hospital as alleged in each of the complaints. Second, pointing to the literal language of the Anchorage trespass ordinance,2 appellants contend that they were not in violation of that ordinance because the person who requested them to leave the building was not an "owner or occupant thereof."
Under Alaska Dist.Ct.R.Crim.P. l(a)3 a complaint constitutes the accusatory pleading by which an offense is charged in a district court proceeding; it serves the same function as does an indictment or information in the superior court. Under Alaska R.Crim.P. 7(c),4 a mere formal defect does not render an indictment insufficient unless it is of a magnitude sufficient to prejudice substantial rights of the defendant. Alaska Dist.Ct.R.Crim.P. 1 directs application of the general Criminal Rule provisions to district court proceedings "[wlherever practicable." In the present case, three of the four complaints were [1077]*1077formally defective in that they alleged that the trespasses occurred in the Alaska Hospital rather than in the Alaska Clinic where they actually did occur. Appellant Head admits that he was arrested for trespassing in the Alaska Hospital as alleged. Both facilities, however, were in fact contained within a single building. Since no prejudice to any appellant is claimed, and since we can perceive none that could be claimed, this asserted defect did not warrant dismissal of the subject complaints. See Price v. State, 437 P.2d 330, 332 (Alaska 1968).
Appellants' second attack on the sufficiency of the complaints is that Anchorage Municipal Code 8.30.010(B)(8)5 requires that a trespasser be requested to depart from the premises by an "owner or occupant" before he can be found to have violated that ordinance. Mingo, the security supervisor for the whole Hospital-Clinic building, was, according to appellants, neither an owner nor an occupant of the building and therefore was not qualified to request them to leave.
Beyond his statements that he was "the building security supervisor" and that he was "employed by the Teamster[s] Union, Local 959," there is nothing in the record to indicate the precise nature of Mingo's employment arrangement with the Hospital or Clinic. Appellants' attack, however, is not based on the extent of Mingo's authority to act on behalf of the Clinic; it depends, rather, on a very literal reading of the trespass statute.6 Appellants' claim assumes without argument that under the ordinance, an "owner or occupant" can never make the request that trespassers depart by acting through an agent. In the absence of argument or authority to the contrary, we see no reason for suspending the general common law of agency in construing section 8.30.010(B)(3) of the Anchorage Municipal Code. Other courts have reasoned similarly. See Johnson v. State, 277 Ala. 655, 173 So.2d 824, 827-28 (1965); People v. Thompson, 56 Ill.App.3d 557, 14 Ill.Dec. 312, 372 N.E.2d 117, 121-22 (1978). The record indicates that Mingo was a duly authorized agent of an "owner or occupant" of the Clinic acting within the seope of his employment, and his request that appellants leave the premises therefore satisfied the requirements of Anchorage Municipal Code 8.80.-010(B)(3). Thus we also reject this facet of appellants' attack on the sufficiency of the complaints.
IL.
THE DEFENSE OF NECESSITY.
Appellants' primary claim is that in attempting to prevent the performance of abortions at the Alaska Clinic, they acted in the reasonable belief that their actions were necessary to protect human life from imminent peril. In spite of both argument and testimony offered at trial that is in apparent conflict with their present position, appellants now insist that:
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OPINION
RABINOWITZ, Chief Justice.
The facts underlying the four criminal convictions appealed from in this case are not in dispute.
On January 6, 1978, members of various anti-abortion groups staged a nationwide protest. In conjunction with that movement, members of Alaska Right to Life staged a demonstration outside of the building housing the Alaska Hospital and the Alaska Clinic in Anchorage. Having decided that they had "tried everything else" and that it was necessary "to try ... peacefully to stop the taking of human life," appellants Head, Fardig, Sigfried and Cleveland entered the Alaska Clinic to conduct a more emphatic protest than the one in progress outside the building. Head and Siegfried proceeded to attach themselves to the door of the Clinic's operating room with handcuffs and chains, while Cleveland and Fardig handcuffed themselves to the operating table.
Shortly after appellants had established themselves in the Clinic, Mingo, the building security supervisor, asked them to leave and then, in response to their refusal, obtained a set of boltcutters. Mingo first cut the handcuffs connecting Head and Sig-fried to the door and escorted 'them from the building. He then returned and, overcoming relatively minor resistance, freed Fardig and Cleveland. Fardig was escorted outside and Cleveland, who refused to walk, was carried out on a sheet, All four were advised not to return unless they needed medical assistance.
Moments later, appellants re-entered the building and again approached the operating room; Mingo stopped them and again requested them to leave. Fardig, Cleveland and Siegfried then sat down on the floor, while Head removed himself to the building's main entrance and sat down there. At that point, city police were summoned. All four appellants were once again requested to leave the premises, and on refusing to do so, were arrested and then removed by police officers.
Appellants were each charged with violating Anchorage's criminal trespass ordi[1076]*1076nance 1 and all were convicted under that ordinance in the district court. The convictions were affirmed on appeal to the superi- or court, and are now before us on appeal from the superior court's affirmance.
Appellants' primary defense at trial was to have depended on the claim that their actions were necessary to avert imminent peril to human life. They allege error in the district court's refusal to instruct the jury on the defense of necessity. Although the trial court excluded that defense, it did allow appellants to defend on the ground that they acted under an honest and reasonable, but mistaken, belief that the necessity defense would protect them from criminal prosecution for their actions. They allege error on the ground that the instructions given on this latter defense were so "confusing and contradictory" as to require reversal. Appellants also seek reversal on the ground that the criminal complaints relied on by the state were defective and on the ground that the cumulative impact of the alleged erfors deprived them of their due process rights under the United States Constitution and the Alaska Constitution.
I.
DEFECTS IN THE COMPLAINTS.
Appellants argue that the criminal complaints in this case were defective in two respects. First, Fardig, Cleveland and Sigfried claim that they were arrested in the Alaska Clinic rather than the Alaska Hospital as alleged in each of the complaints. Second, pointing to the literal language of the Anchorage trespass ordinance,2 appellants contend that they were not in violation of that ordinance because the person who requested them to leave the building was not an "owner or occupant thereof."
Under Alaska Dist.Ct.R.Crim.P. l(a)3 a complaint constitutes the accusatory pleading by which an offense is charged in a district court proceeding; it serves the same function as does an indictment or information in the superior court. Under Alaska R.Crim.P. 7(c),4 a mere formal defect does not render an indictment insufficient unless it is of a magnitude sufficient to prejudice substantial rights of the defendant. Alaska Dist.Ct.R.Crim.P. 1 directs application of the general Criminal Rule provisions to district court proceedings "[wlherever practicable." In the present case, three of the four complaints were [1077]*1077formally defective in that they alleged that the trespasses occurred in the Alaska Hospital rather than in the Alaska Clinic where they actually did occur. Appellant Head admits that he was arrested for trespassing in the Alaska Hospital as alleged. Both facilities, however, were in fact contained within a single building. Since no prejudice to any appellant is claimed, and since we can perceive none that could be claimed, this asserted defect did not warrant dismissal of the subject complaints. See Price v. State, 437 P.2d 330, 332 (Alaska 1968).
Appellants' second attack on the sufficiency of the complaints is that Anchorage Municipal Code 8.30.010(B)(8)5 requires that a trespasser be requested to depart from the premises by an "owner or occupant" before he can be found to have violated that ordinance. Mingo, the security supervisor for the whole Hospital-Clinic building, was, according to appellants, neither an owner nor an occupant of the building and therefore was not qualified to request them to leave.
Beyond his statements that he was "the building security supervisor" and that he was "employed by the Teamster[s] Union, Local 959," there is nothing in the record to indicate the precise nature of Mingo's employment arrangement with the Hospital or Clinic. Appellants' attack, however, is not based on the extent of Mingo's authority to act on behalf of the Clinic; it depends, rather, on a very literal reading of the trespass statute.6 Appellants' claim assumes without argument that under the ordinance, an "owner or occupant" can never make the request that trespassers depart by acting through an agent. In the absence of argument or authority to the contrary, we see no reason for suspending the general common law of agency in construing section 8.30.010(B)(3) of the Anchorage Municipal Code. Other courts have reasoned similarly. See Johnson v. State, 277 Ala. 655, 173 So.2d 824, 827-28 (1965); People v. Thompson, 56 Ill.App.3d 557, 14 Ill.Dec. 312, 372 N.E.2d 117, 121-22 (1978). The record indicates that Mingo was a duly authorized agent of an "owner or occupant" of the Clinic acting within the seope of his employment, and his request that appellants leave the premises therefore satisfied the requirements of Anchorage Municipal Code 8.80.-010(B)(3). Thus we also reject this facet of appellants' attack on the sufficiency of the complaints.
IL.
THE DEFENSE OF NECESSITY.
Appellants' primary claim is that in attempting to prevent the performance of abortions at the Alaska Clinic, they acted in the reasonable belief that their actions were necessary to protect human life from imminent peril. In spite of both argument and testimony offered at trial that is in apparent conflict with their present position, appellants now insist that:
It is vital to understand that these appellants, by their actions on January 6, 1978, were not protesting abortion in general, or engaging in symbolic acts which they hoped would lead the public to sympathize with the prolife cause. Rather, they were directly intervening to protect the particular human lives threatened with imminent destruction at Alaska Hospital and Clinic in the abortion chambers they entered, on that very day.
In support of their position appellants cite newspaper articles7 describing two unreported Fairfax County, Virginia, district court cases8 in which trespassers in an abortion clinic were acquitted on this theory.
[1078]*1078The defense of necessity requires a showing of three essential elements:
1) The act charged must have been done to prevent a significant evil; 2) there must have been no adequate alternative; 8) the harm caused must not have been disproportionate, to the harm avoided.9
It is available if the accused reasonably believed at the time of acting that the first and second elements were present, even if that belief was mistaken; but the accused's belief will not suffice for the third element. An objective determination must be made as to whether the defendant's value judgment was correct, given the facts as he reasonably perceived them. Nelson v. State, 597 P.2d 977, 979, 980 n.6 (Alaska 1979).
Relying heavily on State v. Marley, 54 Haw. 450, 509 P.2d 1095 (1973), the district court refused to allow the jury to consider the defense of necessity. Appellants argue that their presence "prevented the killing of children which was imminent" because "the potential victims and their mothers could not be brought to the abortion chambers through hallways and doors which the appellants were blocking."
There are several flaws in appellants' argument. First, the emergency which produces the "necessity" behind the charged act must generally be a result of the "physical forces of nature." W. LaFave & A. Scott, Criminal Law § 50, at 881. Generally, when the threatened harm emanates from a human source, an actor who violates the law in response to it can defend only on the grounds of duress, defense of others, or crime prevention. Id.10 The de[1079]*1079fense of duress is clearly inappropriate here since appellants do not claim that their illegal acts were compelled by "the unlawful threats of another." E. Arnolds & N. Garland, The Defense of Necessity in Criminal Law: The Right to Choose the Lesser Evil, 65 J.Crim.L. & Criminology 289, 290 (1974). The other two related defenses-defense of others and crime prevention-require that the harm avoided by the charged act be unlawful. R. Perkins, Criminal Law 1019 (24 ed. 1969).11 Abortion, or the "killing of unborn children" as appellants characterize it, is not unlawful in this state, as appellants concede.12 Given these principles, appellants' argument must fail since the alleged harm sought to be avoided did not arise from a natural source and was not unlawful.
Second, we find the reasoning of the Hawaii Supreme Court in State v. Marley, 509 P.2d 1095 (Hawaii 1973), persuasive. In Marley, the defendants were convicted of criminal trespass after entering the offices of Honeywell Corporation in an attempt to stop the "war crimes" being committed by Honeywell. As in the present case, the Marley defendants' behavior was nonviolent but was disruptive of normal business operations. Id. at 1099. Their necessity defense was rejected for three reasons, two of which we find applicable here: first, "[where there is a third alternative available to defendants that does not involve violation of the law, defendants are not justified in violating the law. Other forms of non-criminal protest were and are available to defendants to enable them to dramatize, and hence hopefully terminate, conduct which they may view [as] harmful." Marley, 509 P.2d at 1109 (citations omitted). Second, defendants are "unentitled to the defense of 'necessity' because their actions were not reasonably designed to actually prevent the threatened greater harm .... Under any possible set of hypotheses, defendants could foresee that their actions would fail to halt" the practices to which they objected. Id.
Appellants seek to distinguish Marley on the ground that the alleged harm in that case-the manufacture of weapons to be used in the Vietnam war-was spacially and temporally remote from the site of the trespass whereas the abortions they prevented were scheduled in the very rooms appellants occupied and blocked, within minutes of the time of their entry. However, the lack of "imminence" in Marley was only one of the three grounds relied upon by the court, and the differences between this case and Marley do not render [1080]*1080the other two grounds less applicable. In other respects, the facts of the two cases are closely analogous. In both cases, it was obvious to the trespassers that their actions could not halt the alleged greater harm to which society had given its imprimatur, but rather that, at best, the harm could be only postponed for a brief interval, following which society's normal operations would reassert themselves. This was simply not the kind of emergency situation contemplated by the defense of necessity.
Further, in spite of appellants' protestations to the contrary, their acts, like the acts of the Marley defendants, are much more appropriately characterized as protesting with the intent to "dramatize, and hence hopefully terminate, conduct which they may view [as] harmful," id. at 1109, then, as appellants describe their own behavior, "directly intervening to avert an imminent threat to human life." Appellants' protest was, in fact, .part of a nationwide protest that resulted in several similar arrests in other cities. Appellants appear to concede that if their actions are best described as a protest, the necessity defense would be unavailable. We think it manifest that it would be inappropriate to characterize these trespasses as anything other than a protest, and that appellants' argument of necessity must therefore be rejected.
Third, the defense of necessity requires a showing that the harm sought to be avoided was greater than the harm reasonably foreseeable as resulting from a defendant's illegal actions. Nelson v. State, 597 P.2d 977, 980 (Alaska 1979). That is, the harm reasonably foreseeably resulting from a failure to act must be balanced against that fore-seeably resulting from the illegal action. We believe that harm to both the Clinic and its patients was reasonably foreseeable to the trespassers. The Clinic's schedule was disrupted and its operating room required resterilization; and it was certainly foreseeable that the patients scheduled to undergo abortions at the time the demonstration cecurred would suffer emotional distress as a result of appellants' invasion of their privacy during a particularly sensitive period.
Against this must be weighed the foreseeable results of appellants' failure to intervene-the routine performance of abortions, or, as appellants regard it, the killing of human life. Appellants acknowledge that the Supreme Court of the United States has expressly rejected the identification of fetuses as "persons" in this context. Roe v. Wade, 410 U.S. 113, 93 S.Ct. 705, 728-730, 156-59, 35 L.Ed.2d 147, 179-80, reh. denied, 410 U.S. 959, 93 S.Ct. 1409, 35 L.Ed.2d 694 (1973). Appellants' view is that Roe v. Wade, although foreclosing the possibility of action by state officials to protect fetuses until viability, does not prohibit similar actions by individuals The question, then, is a familiar one: whether appellants can, by appeal to a "higher law," justify their illegal attack on a form of government-approved behavior. Citing this court to two unreported cases 13 and the Nuremberg Trials,14 appellants seek a ruling that, as a general principle, abortion is a more significant evil than trespass.
However, even assuming that appellants are correct in arguing that Roe v. Wade does not control as to the weight to be accorded "potential life" in this context,15 the United States Supreme Court is not the only authority to which we must defer in [1081]*1081this area. The Alaska legislature is better suited to strike the balance than is this court. Indeed, the law of necessity itself requires us to consult the legislature's enactments:
The defense of necessity is available only in situations wherein the legislature has to itself, in its criminal statute, made a determination of values. If it has done so, its decision governs.
LaFave and Scott, supra, § 50 at 382.16
Alaska's legislature has, we think, already spoken as to the balancing before us, and concluded that the interests in potential life appellants sought to vindicate are outweighed by the very privacy interests appellants sought to invade.17 Thus, we cannot agree that any abortions that were delayed by appellants' demonstration can be characterized as sufficiently harmful to outweigh the harm that was the foreseeable result of appellants' behavior.
We hold that the trial court's rejection of appellants' necessity defense was proper.18 We are in agreement with the District of Columbia Court of Appeals' response to the [1082]*1082necessity defense raised by participants in a similar anti-abortion demonstration:
Unlike medical necessity or other emer-geney situations, the necessity cited by appellants cannot shield them from criminal liability for their acts.
The rights to free speech, to assembly, and to petition the government for grievances are a cornerstone of the American system. So, too, is the right to be free from criminal interference. These appellants trespassed on the rights of others and did so without excuse.
Gaetano v. United States, 406 A.2d 1291, 1295 (D.C.App.1979).
III.
JURY INSTRUCTIONS.
Appellants assert that the following three instructions were so "confusing and contradictory" as to require reversal:
two. 7
In the crime charged in the complaint, there must exist a union or joint operation of act or conduct and criminal intent. To constitute criminal intent it is not necessary that there should exist an intent to violate the law.
[NO. 8]
In this case, if you find from the evidence that a defendant honestly believed that he or she had a right to remain on the premises occupied by Alaska Hospital and Clinic even after being instructed to leave, and that such belief was based upon reasonable grounds, and that the conduct of each defendant would have been lawful and proper had the facts been such as defendant honestly believed them to be, then you must find such defendant not guilty.
[NO. 9]
To constitute the defense of necessity, the defendants would have had to show that they were attempting to prevent some harm that was within their presence. Since the facts of this case have shown that the defendants were not attempting to prevent harm within their presence, the defense of necessity is not applicable. Therefore, you may not consider the defense of necessity in your deliberations.
On appeal, the superior court agreed that the instructions were inconsistent, but held that the inconsistency did not require reversal. In its written opinion, the superior court stated:
The real problem is that instruction no. 8 states a proposition of law that is inapplicable to these cases. In essence, instruction no. 8 is an instruction on mistake of law as a defense. Mistake of law is not a defense applicable to the municipal trespass ordinance (A0 8.30.010) under which appellants were charged. Consequently, the judge gave an unwarranted instruction. The fact that instructions nos. 7 and 9 were inconsistent with no. 8 simply served to cure the error of giving no. 8. The error was harmless, as it is clear that the jury rejected the erroneous mistake of law instruction, so that 'the jury was not substantially swayed or affected by the error.' Adkins v. Lester, 530 P.2d 11, reh. den., 532 P.2d 1027 (Alaska 1974).
Instruction number eight was based upon the trial court's view that, although appellants could not defend on the basis of necessity, they could seek to excuse their conduct [1083]*1083on the ground that they honestly and reasonably believed that that defense justified their presence at the Clinic. Three of the four appellants testified that they were aware of two judicial decisions in which, on facts virtually identical to those in the present case, defendants were acquitted on the ground of necessity.19 All four testified that they believed they had a legal right to enter the Clinic in an attempt to prevent abortions from being performed. The instruction, then, would have required acquittal had the jury found these beliefs to be both honest and reasonable.
At trial, the state argued that the mistake of law defense, as presented by appellants, is only applicable if the mistaken reliance is upon the statutory, administrative, or case law of either the United States or the state in which the illegal actions were committed. We have found no authority, and appellants cite none, for the proposition that an individual is justified in relying on the case law of other jurisdictions in deciding on a course of conduct.
Since the cases relied upon by appellants were both decided by a trial court in Fairfax County, Virginia, the defense of "reliance of a judicial decision" is inapplicable to the present case. The district court therefore committed error in giving instruction number eight.
We must agree with appellants' claim that the three instructions taken together were confusing. Instruction seven explains, correctly, that the criminal intent necessary to convict does not include intent to violate the law. Instruction eight, however, indicates that if the appellants honestly and reasonably believed their actions did not violate the law, they were not guilty. Instruction nine states the court's correct finding that the necessity defense was not available. Instructions eight and nine, taken together, express the court's erroneous view that an honest and reasonable belief in the availability of that defense could excuse the appellants' violations. Instruction seven, on the other hand, indicates that appellants need not have intended that their conduct be illegal to be convicted even if he thinks his conduct is legal and that he cannot be convicted. The instructions seem to say both that a defendant can be convicted if he reasonably and honestly believes his conduct to be legal.
As the superior court pointed out, instruction eight described a defense that was unavailable to appellants in this case. That instruction could have only operated in appellants' favor, however, and we agree with the superior court's conclusion that "it is clear that the jury rejected the erroneous . instruction." We also agree with the superior court's further conclusion that "the jury was not substantially swayed or affected by the error"; as such, it did not affect appeliants' substantial rights and was therefore harmless under Love v. State, 457 P.2d 622, 631 (Alaska 1969).
Having discerned only the single harmless error discussed above, we perceive no merit in appellants' final claim-that the cumulative effect of the errors alleged to have been committed by the trial court deprived them of the "level of procedural fairness" required by the due process clauses of the United States and Alaska Constitutions. The convictions of appellants are AFFIRMED.
DIMOND, Senior Justice, concurs.
COMPTON, J., not participating.