STEINMETZ, J.
The issues in this case are: (1) whether sec. 940.09(1) (a), Stats.,1 proscribing the crime of homicide by an intoxicated operation of a motor vehicle is unconstitutional in that it does not require a causal connection between the intoxicated condition of the operator and the death of another person; (2) whether the affirmative defense provision set out in sec. 940.09 (2) invades his right against self-incrimination guaranteed by the Fifth Amendment to the United States Constitution; and (3) whether the trial court’s refusal to instruct the jury on the affirmative defense set 'out in sec. 940.09(2) denied the defendant due process and a fair trial.
The defendant, Gary Caibaiosai, was charged with violating sec. 940.09(1) (a), Stats., by operating a motor vehicle while under the influence of an intoxicant which resulted in the death of Janet M. Tunkieicz. He was tried by a jury, found guilty and on February 24, 1983, was sentenced to serve a term of imprisonment not to exceed three years.
The defendant filed a post-conviction motion for a new trial on the grounds that: sec. 940.09(1) (a), Stats., is unconstitutional; sec. 940.09(2) invades his right against self-incrimination; and it was an abuse of discretion to [590]*590refuse to give an instruction to the jury on the affirmative defense. Alternatively, that motion requested a reduction of his sentence. After a hearing, the trial court denied the motion and defendant filed a notice of appeal. The court of appeals certified the appeal to this court and we granted certification.
On June 6, 1982, at approximately 8:04 p.m., defendant was driving his 1977 Harley-Davidson motorcycle eastbound on Highway 142 in the vicinity of county Highway “MB” with Janet Tunkieicz as his passenger. Ahead of the defendant was David Dickinson operating a motorcycle with his passenger Yvonne Mink in the sidecar. At the trial, Mink testified the defendant and Tunkieicz pulled into the oncoming lane and passed them. She estimated that the defendant was driving somewhere between 60 and 65 miles per hour at the moment that he passed her. Dickinson and Mink also gave confusing and conflicting testimony concerning another motorcycle operated by Doug Hilliary, but it is not clear whether the defendant passed Hilliary or what Hilliary’s exact position was at the time of the accident. After the defendant completed the pass and pulled back into the right lane, Mink observed his brake light flash and then his motorcycle go into the gravel along a curve in the road and skid into the three to four foot deep ditch along the side of the road. She did not identify the location of the gravel in reference to the pavement or the shoulder of the highway. Defendant’s motorcycle traveled approximately 180 to 200 feet, struck a utility pole and flipped over causing Tunkieicz to strike a tree approximately 80 feet from the utility pole. Janet Tunkieicz was killed instantly. Upon impact the defendant was thrown clear, remained conscious and was not seriously injured.
Evidence was admitted that at approximately 10:09 p.m., a blood sample was taken from the defendant and later tested for alcohol content which registered at 0.13 [591]*591percent. At 10:39 p.m. defendant was tested on a breathalyzer, and his blood alcohol level was listed as 0.11 percent.
The defense presented one witness, David Dickinson, the operator of the motorcycle on which Mink was a passenger. He testified he was a motorcycle mechanic and had a long history of owning and operating motorcycles. He testified he had lost control of motorcycles on numerous occasions and that a passenger riding on the back of a motorcycle could easily affect the controlla-bility of the motorcycle. He also testified that road conditions could also cause a motorcyclist to lose control.
Dickinson stated he was operating his motorcycle at around the speed limit on Highway 142 when the defendant’s motorcycle passed his. He described the accident by saying that it looked like the defendant’s motorcycle had gone “towards the gravel” and a cloud of dust was raised. Dickinson testified he saw “a cloud of dust and it looked like the defendant recovered for a second and then the bike went down in the ditch.” The defendant presented no other evidence and did not testify in his own behalf.
Section 940.09, Stats., was designed to protect the public from a particular type of risk and harm, namely to hold accountable persons who become intoxicated, operate a motor vehicle and cause the death of another person. In the preface to the latest revisions of the drunk driving laws, the legislature expressly stated that its purpose was to “provide maximum safety for all users of the highway of this state” from the harm threatened by “[o]peration of motor vehicles by persons who are under the influence of an intoxicant.” Laws of 1981, ch. 20, secs. 2051 (13) (a) 1 and 2051 (13) (b) 1.
From the creation of sec. 940.09, Stats., to 1955 there were only two elements of the offense: causing the death of another person by the operation of a vehicle and being [592]*592under the influence of an intoxicant at the time of the accident. State v. Peckham, 263 Wis. 239, 242, 56 N.W. 2d 835 (1953). The Peckham court held that there was negligence in “the driving of an automobile while under the influence of intoxicating liquor.” Id. at 243. This statement was based on an earlier declaration of this court in Tomasik v. Lanferman, 206 Wis. 94, 238 N.W. 857 (1931) as follows:
“One intoxicated is without proper control of all those faculties the exercise of which is necessary to avoid danger to others while driving a car upon a public highway. The driving of a car by one in such condition betrays an absence of any care, and indicates such recklessness and wantonness as evinces an utter disregard of consequences.” Id. at 97.
As this court stated in State v. Resler, 262 Wis. 285, 290, 55 N.W.2d 35 (1952) :
“ [T] o require that facts be shown to prove that defendant’s operation of the car was so affected by his intoxication that the accident would not have happened if he had been sober, would be to impose an impossible burden upon the state in the prosecution of such a case.” Id. at 290.
Moreover, “If it can also be shown that the defendant was intoxicated when he so operated his vehicle, it must be assumed that there existed a causal connection between the intoxication and the death.” Id. at 290, citing Tomasik.
In 1955 the legislature revised the statute to provide that a person was guilty of homicide by an intoxicated use of a vehicle if he caused the death of another “by the negligent operation ... of a vehicle . . . while under the influence of an intoxicant.” Sec. 940.09, 1955. The only change in the elements of the offense was the requirement of “proof of causal negligence in addition to [the] operation or handling [of a vehicle] while under [593]*593the influence of an intoxicant.” There was still no requirement that the defendant’s intoxication cause the victim’s death. See Bennett v. State, 54 Wis. 2d 727, 730, 196 N.W.2d 704 (1972).
Section 940.09 (1) (a), Stats.,2 in its present form clearly states that a person commits a Class D felony who:
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STEINMETZ, J.
The issues in this case are: (1) whether sec. 940.09(1) (a), Stats.,1 proscribing the crime of homicide by an intoxicated operation of a motor vehicle is unconstitutional in that it does not require a causal connection between the intoxicated condition of the operator and the death of another person; (2) whether the affirmative defense provision set out in sec. 940.09 (2) invades his right against self-incrimination guaranteed by the Fifth Amendment to the United States Constitution; and (3) whether the trial court’s refusal to instruct the jury on the affirmative defense set 'out in sec. 940.09(2) denied the defendant due process and a fair trial.
The defendant, Gary Caibaiosai, was charged with violating sec. 940.09(1) (a), Stats., by operating a motor vehicle while under the influence of an intoxicant which resulted in the death of Janet M. Tunkieicz. He was tried by a jury, found guilty and on February 24, 1983, was sentenced to serve a term of imprisonment not to exceed three years.
The defendant filed a post-conviction motion for a new trial on the grounds that: sec. 940.09(1) (a), Stats., is unconstitutional; sec. 940.09(2) invades his right against self-incrimination; and it was an abuse of discretion to [590]*590refuse to give an instruction to the jury on the affirmative defense. Alternatively, that motion requested a reduction of his sentence. After a hearing, the trial court denied the motion and defendant filed a notice of appeal. The court of appeals certified the appeal to this court and we granted certification.
On June 6, 1982, at approximately 8:04 p.m., defendant was driving his 1977 Harley-Davidson motorcycle eastbound on Highway 142 in the vicinity of county Highway “MB” with Janet Tunkieicz as his passenger. Ahead of the defendant was David Dickinson operating a motorcycle with his passenger Yvonne Mink in the sidecar. At the trial, Mink testified the defendant and Tunkieicz pulled into the oncoming lane and passed them. She estimated that the defendant was driving somewhere between 60 and 65 miles per hour at the moment that he passed her. Dickinson and Mink also gave confusing and conflicting testimony concerning another motorcycle operated by Doug Hilliary, but it is not clear whether the defendant passed Hilliary or what Hilliary’s exact position was at the time of the accident. After the defendant completed the pass and pulled back into the right lane, Mink observed his brake light flash and then his motorcycle go into the gravel along a curve in the road and skid into the three to four foot deep ditch along the side of the road. She did not identify the location of the gravel in reference to the pavement or the shoulder of the highway. Defendant’s motorcycle traveled approximately 180 to 200 feet, struck a utility pole and flipped over causing Tunkieicz to strike a tree approximately 80 feet from the utility pole. Janet Tunkieicz was killed instantly. Upon impact the defendant was thrown clear, remained conscious and was not seriously injured.
Evidence was admitted that at approximately 10:09 p.m., a blood sample was taken from the defendant and later tested for alcohol content which registered at 0.13 [591]*591percent. At 10:39 p.m. defendant was tested on a breathalyzer, and his blood alcohol level was listed as 0.11 percent.
The defense presented one witness, David Dickinson, the operator of the motorcycle on which Mink was a passenger. He testified he was a motorcycle mechanic and had a long history of owning and operating motorcycles. He testified he had lost control of motorcycles on numerous occasions and that a passenger riding on the back of a motorcycle could easily affect the controlla-bility of the motorcycle. He also testified that road conditions could also cause a motorcyclist to lose control.
Dickinson stated he was operating his motorcycle at around the speed limit on Highway 142 when the defendant’s motorcycle passed his. He described the accident by saying that it looked like the defendant’s motorcycle had gone “towards the gravel” and a cloud of dust was raised. Dickinson testified he saw “a cloud of dust and it looked like the defendant recovered for a second and then the bike went down in the ditch.” The defendant presented no other evidence and did not testify in his own behalf.
Section 940.09, Stats., was designed to protect the public from a particular type of risk and harm, namely to hold accountable persons who become intoxicated, operate a motor vehicle and cause the death of another person. In the preface to the latest revisions of the drunk driving laws, the legislature expressly stated that its purpose was to “provide maximum safety for all users of the highway of this state” from the harm threatened by “[o]peration of motor vehicles by persons who are under the influence of an intoxicant.” Laws of 1981, ch. 20, secs. 2051 (13) (a) 1 and 2051 (13) (b) 1.
From the creation of sec. 940.09, Stats., to 1955 there were only two elements of the offense: causing the death of another person by the operation of a vehicle and being [592]*592under the influence of an intoxicant at the time of the accident. State v. Peckham, 263 Wis. 239, 242, 56 N.W. 2d 835 (1953). The Peckham court held that there was negligence in “the driving of an automobile while under the influence of intoxicating liquor.” Id. at 243. This statement was based on an earlier declaration of this court in Tomasik v. Lanferman, 206 Wis. 94, 238 N.W. 857 (1931) as follows:
“One intoxicated is without proper control of all those faculties the exercise of which is necessary to avoid danger to others while driving a car upon a public highway. The driving of a car by one in such condition betrays an absence of any care, and indicates such recklessness and wantonness as evinces an utter disregard of consequences.” Id. at 97.
As this court stated in State v. Resler, 262 Wis. 285, 290, 55 N.W.2d 35 (1952) :
“ [T] o require that facts be shown to prove that defendant’s operation of the car was so affected by his intoxication that the accident would not have happened if he had been sober, would be to impose an impossible burden upon the state in the prosecution of such a case.” Id. at 290.
Moreover, “If it can also be shown that the defendant was intoxicated when he so operated his vehicle, it must be assumed that there existed a causal connection between the intoxication and the death.” Id. at 290, citing Tomasik.
In 1955 the legislature revised the statute to provide that a person was guilty of homicide by an intoxicated use of a vehicle if he caused the death of another “by the negligent operation ... of a vehicle . . . while under the influence of an intoxicant.” Sec. 940.09, 1955. The only change in the elements of the offense was the requirement of “proof of causal negligence in addition to [the] operation or handling [of a vehicle] while under [593]*593the influence of an intoxicant.” There was still no requirement that the defendant’s intoxication cause the victim’s death. See Bennett v. State, 54 Wis. 2d 727, 730, 196 N.W.2d 704 (1972).
Section 940.09 (1) (a), Stats.,2 in its present form clearly states that a person commits a Class D felony who:
(1) causes the death of another,
(2) by the operation of a vehicle,
(3) while under the influence of an intoxicant.
Under our laws, some acts performed with no particular mental state and even without a particular result, are considered sufficiently antisocial enough to qualify as a crime, e.g., sec. 940.225(1) (b), Stats., (sexual assault using a dangerous weapon). Other acts must be accompanied by a particular mental state in the performance of an act to make them sufficiently antisocial, e.g., sec. 943.10 (1) (burglary, i.e., entry with intent to steal or commit a felony). In still other instances, acts performed with a particular state of mind must cause a particular result to give them sufficient antisocial significance to justify treating the perpetrator as a criminal, e.g., sec. 940.01 (murder).
The legislature has determined that combining the operation of a motor vehicle with being in an intoxicated state is conduct which is malum prohibitum and is pervasively antisocial. Since the conduct is considered inherently evil, it conceptually cannot be divided into portions which are bad and portions which are not bad. Section 346.63, Stats., entitled “Operating under the influence of intoxicants” is violated by a person who, one, operates a motor vehicle, and two, is at the time under the influence of an intoxicant. The commission of the offense does not require any erratic or negligent driving. Because driving under the influence of an in[594]*594toxicant is malum prohibitum it is impossible to separate the intoxication from the driving- or the driving from the intoxication. The result is the potentially lethal and illegal combination of driving while intoxicated.
Section 940.09, Stats., requires that the prosecution prove and the jury find beyond a reasonable doubt a causal connection between the defendant’s unlawful conduct, operation of a motor vehicle while intoxicated, and the victim’s death. The statute does not include as an element of the crime a direct causal connection between the fact of defendant’s intoxication, conceptualized as an isolated act, and the victim’s death. Under this statute there is an inherently dangerous activity in which it is reasonably foreseeable that driving while intoxicated may result in the death of an individual. The legislature has determined this activity so inherently dangerous that proof of it need not require causal connection between the defendant’s intoxication and the death.
In deciding the constitutionality of the statutorily increased penalty where the acts of contributing to the delinquency of a child resulted in death, we stated in State ex rel. Schulter v. Roraff, 39 Wis. 2d 342, 355, 159 N.W.2d 25 (1968) :
“What punishment is to be related to a particular crime is within the province of the legislature and the relating process is governed by the constitution to the extent no cruel and inhuman punishment is permitted and due process and equal protection are afforded.
“We think the consequences of the act and their seriousness may be a proper consideration in fixing the severity of the punishment. Foreseeability or intent that the specific consequences occur are not necessary to due process or to a crime. Acts which result in death frequently carry increased penalties over the same act which does not result in death, i.e., sec. 940.03, Stats., felony murder. We think there is sufficient connection even if it is only causation between the proscribed act of contributing to the delinquency of a child and death result[595]*595ing from such delinquency to make an increased penalty reasonable and not arbitrary even though death is unintended or unforeseen.”
In discussing strict criminal liability imposed on persons who fail to have a license or comply with regulations when trafficking in drugs or in firearms, we stated in State v. Collova, 79 Wis. 2d 473, 484, 255 N.W.2d 581 (1977) :
“But such acts are in and of themselves not innocent acts. Persons who choose to engage in these kinds of unusual and dangerous activities may reasonably be held to the highest standards of care and precision, enforced by strict criminal liability, in conforming to government regulations.”
So, when a person chooses to operate an automobile while under the influence of intoxicants and has done so deliberately knowing that society has through its legislature established such combined activities as dangerous and when such operation results in death, it may be punished as a felony.
It is negligence per se to operate a motor vehicle while under the influence of intoxicants. Experience has established this conclusion and the legislature has accepted it as a fact in sec. 346.63(1) (a), Stats., and has made such combined activities a class D felony when the operation of the vehicle results in death in sec. 940.09(1) (a). The substantial factor in the cause of the death is the cause in fact of the operation of the vehicle while intoxicated. Section 940.09(1) (a) accepts that the conduct of operating under the influence of intoxicants plus the consequences of death will result in a felony charge. The people of this state through their legislature have determined in sec. 940.09(1) (a) that the operation of a motor vehicle by one who is under the influence of intoxicants is a risk that will not be tolerated.
[596]*596Section 940.09(2), Stats.,3 provides an affirmative defense for a defendant tried for causing the death of another by the operation of a motor vehicle while under the influence of an intoxicant. It is meant to provide a defense for the situation where there is an intervening cause4 between the intoxicated operation of the automobile and the death of an individual. The defendant argues that this affirmative defense provision to be exercised invades his right against self-incrimination guaranteed by the Fifth Amendment to the United States Constitution.5 He states that if he is the only possible witness able to present evidence in support of the defense, then he will be forced to testify. This argument has already been considered and denied by the United States Supreme Court in Williams v. Florida, 399 U.S. 78, 83-84 (1970) :
[597]*597“The defendant in a criminal trial is frequently forced to testify himself and to call other witnesses in an effort to reduce the risk of conviction. When he presents his witnesses, he must reveal their identity and submit them to cross-examination which in itself may prove incriminating or which may furnish the State with leads to incriminating rebuttal evidence. That the defendant faces such a dilemma demanding a choice between complete silence and presenting a defense has never been thought an invasion of the privilege against compelled self-incrimination. The pressures generated by the State’s evidence may be severe but they do not vitiate the defendant’s choice to present an [affirmative] defense and witnesses to prove it, even though the attempted defense ends in catastrophe for the defendant. However ‘testimonial’ or ‘incriminating’ the [affirmative] defense proves to be, it cannot be considered ‘compelled’ within the meaning of the Fifth and Fourteenth Amendments.”
The Williams court was speaking of the affirmative defense of alibi. (See also Barnes v. United States, 412 U.S. 837, 846-47 (1973) regarding statutory presumptions and inferences requiring the defendant to introduce rebuttal evidence.)
In United States v. Washington, 431 U.S. 181, 187 (1977), the Supreme Court held the fifth amendment’s privilege against self-incrimination proscribes only self-incrimination obtained by a “genuine compulsion of testimony” it proscribes only officially coerced self-incrimination. The availability or attraction of an affirmative defense does not amount to compulsion in the constitutional sense. In Yee Hem v. United States, 268 U.S. 178, 185 (1925), the Court stated:
“The point that the practical effect of the statute creating the presumption is to compel the accused person to be a witness against himself may be put aside with slight discussion. The statute compels nothing. It does no more than to make possession of the prohibited article prima facie evidence of guilt. It leaves the accused entirely free to testify or not as he chooses. If the accused [598]*598happens to be the only repository of the facts necessary to negative the presumption arising from his possession, that is a misfortune which the statute under review does not create but which is inherent in the case. The same situation might present itself if there were no statutory presumption and a prima facie case of concealment with knowledge of unlawful importation were made by the evidence. The necessity of an explanation by the accused would be quite as compelling in that case as in this; but the constraint upon him to give testimony would arise there, as it arises here, simply from the force of circumstances and not from any form of compulsion forbidden by the Constitution.”
The legislature in sec. 940.09 (2), Stats., has recognized there may be intervening factors between the fact of operating an automobile under the influence of intoxicants and the death of another and that the defendant should have that defense available to be proven by a preponderance of the evidence. This approach avoids a mechanistic definition of the offense based only on the antisocial act and its consequences which punish even those who might be able to establish some degree of excuse for their conduct. Patterson v. New York, 432 U.S. 197, 211-12, n. 13 (1977).
The last issue presented by the defendant concerns the refusal of the trial court to give the affirmative defense instruction under sec. 940.09 (2), Stats., to the jury. The defendant requested the affirmative defense portion of Wis. JI — Criminal, Part I, No. 1185.6 In denying his [599]*599request, the trial court found there was no evidence shown “that this accident and this death would have occurred had — even though he had not been under the influence.” The defendant argues he was entitled to the affirmative defense instruction since his witness, David Dickinson, testified that a passenger on the back of a motorcycle could easily affect the controllability of the vehicle and that road conditions could cause a motorcycle to leave the road and crash. Dickinson testified the defendant had gone “towards the gravel” and a cloud of dust was raised before it appeared the defendant lost control of the motorcycle. This is all speculative evidence incapable of rising to prima facie proof of the intervening cause of the death, much less rising to a greater weight of the credible evidence that the death would have occurred even if the defendant had not been under the influence of an intoxicant. Dickinson did not testify that the defendant’s passenger did anything to affect the operation of the motorcycle or that the road conditions present actually affected the defendant’s operation. He did not testify the defendant went over [600]*600gravel but only went “towards the gravel” and that he saw a cloud of dust. The gravel was not identified by Dickinson as being on the pavement or on the shoulder of the road.
Since the legislature has made the affirmative defense available to defendants charged with a violation of sec. 940.09(1) (a), Stats., trial judges have a duty to so instruct the jury in all cases when any exonerating evidence is received tending to show that the death would have occurred even if the defendant had not been under the influence of intoxicants. However, in this case, there was only speculative evidence offered by defendant’s witness as to an intervening cause with no direct evidence which showed any cause of this death other than the operation of the motorcycle by the defendant while he was intoxicated.
The trial and appellate counsels for the defendant argued that the affirmative defense should be available if the death was caused by the defendant’s negligence and, therefore, was not caused by his intoxicated operation. In argument before this court, the defendant’s position was that all that is required for the affirmative defense to be available is that the accident “would have occurred without the intoxication.” This is not a correct application of the affirmative defense. If it were, the defendant could exonerate himself by claiming he was negligent and thereby avoid the consequences of having caused the death while operating a motor vehicle while intoxicated. The defendant’s negligence is not an element to be proven in prosecuting this offense and is not an affirmative defense to its commission.
The only evidence offered by Dickinson was the defendant’s speed on passing him between 65 to 70 miles per hour and the vague testimony as to gravel in the area where the defendant left the paved portion of the [601]*601road. He did not testify that the defendant’s passenger affected the defendant’s control of the motorcycle or that the road conditions or design caused the defendant to leave the roadway and hit the pole, which impact caused his passenger to hit a tree and be killed. The proof offered for the affirmative defense was speculative and not direct evidence and could not rise to the level required of preponderance. If the instruction as to the affirmative defense had been given to the jury based on the available evidence, it would have allowed the jury to speculate at the very best that the death of Tunkieicz was caused by circumstances other than the defendant’s operating the motorcycle while intoxicated.
The legislature has created sec. 940.09(1) (a), Stats., in a continuing effort to keep drivers who are under the influence of intoxicants off the highway. It reflects the public’s attitude and belief that such drivers are a sinister hazard per se and if death results from such operation, defendants may be properly found guilty of the class D felony.
By the Court. — The order of the circuit court is affirmed.