The following are excerpts from the Supreme Court ruling in the case of Roper, Superintendent, Potosi Correctional Center v. Simmons, which outlawed juvenile executions. Quoted material comes from court documents filed in the case.
Writing for the majority was Justice Anthony Kennedy:
Three general differences between juveniles under 18 and adults demonstrate that juvenile offenders cannot with reliability be classified among the worst offenders. First, as any parent knows and as the scientific and sociological studies respondent and his AMICI cite tend to confirm, "(a) lack of maturity and an underdeveloped sense of responsibility are found in youth more often than in adults and are more understandable among the young. These qualities often result in impetuous and ill-considered actions and decisions." It has been noted that "adolescents are over represented statistically in virtually every category of reckless behavior." In recognition of the comparative immaturity and irresponsibility of juveniles, almost every State prohibits those under 18 years of age from voting, serving on juries, or marrying without parental consent.
The second area of difference is that juveniles are more vulnerable or susceptible to negative influences and outside pressures, including peer pressure. This is explained in part by the prevailing circumstance that juveniles have less control, or less experience with control, over their own environment. ...
The third broad difference is that the character of a juvenile is not as well formed as that of an adult. The personality traits of juveniles are more transitory, less fixed.
These differences render suspect any conclusion that a juvenile falls among the worst offenders. The susceptibility of juveniles to immature and irresponsible behavior means "their irresponsible conduct is not as morally reprehensible as that of an adult." The reality that juveniles still struggle to define their identity means it is less supportable to conclude that even a heinous crime committed by a juvenile is evidence of irretrievably depraved character. From a moral standpoint it would be misguided to equate the failings of a minor with those of an adult, for a greater possibility exists that a minor's character deficiencies will be reformed.
In concluding that neither retribution nor deterrence provides adequate justification for imposing the death penalty on juvenile offenders, we cannot deny or overlook the brutal crimes too many juvenile offenders have committed. Certainly it can be argued, although we by no means concede the point, that a rare case might arise in which a juvenile offender has sufficient psychological maturity, and at the same time demonstrates sufficient depravity, to merit a sentence of death. We disagree. The differences between juvenile and adult offenders are too marked and well understood to risk allowing a youthful person to receive the death penalty despite insufficient culpability.
It is proper that we acknowledge the overwhelming weight of international opinion against the juvenile death penalty, resting in large part on the understanding that the instability and emotional imbalance of young people may often be a factor in the crime. The opinion of the world community, while not controlling our outcome, does provide respected and significant confirmation for our own conclusions.
The dissent, written by Justice Antonin Scalia:
Consulting States that bar the death penalty concerning the necessity of making an exception to the penalty for offenders under 18 is rather like including old-order Amishmen in a consumer-preference poll on the electric car. Of COURSE they don't like it, but that sheds no light whatever on the point at issue. That 12 States favor NO executions says something about consensus against the death penalty, but nothing—absolutely nothing—about consensus that offenders under 18 deserve special immunity from such a penalty. In repealing the death penalty, those 12 States considered none of the factors that the Court puts forth as determinative of the issue before us today—lower culpability of the young, inherent recklessness, lack of capacity for considered judgment, etc. What might be relevant, perhaps, is how many of those States permit 16- and 17-year-old offenders to be treated as adults with respect to non-capital offenses. (They all do; indeed, some even require that juveniles as young as 14 be tried as adults if they are charged with murder.) The attempt by the Court to turn its remarkable minority consensus into a faux majority by counting Amishmen is an act of nomological desperation.
Today's opinion provides a perfect example of why judges are ill equipped to make the type of legislative judgments the Court insists on making here. To support its opinion that States should be prohibited from imposing the death penalty on anyone who committed murder before age 18, the Court looks to scientific and sociological studies, picking and choosing those that support its position. It never explains why those particular studies are methodologically sound; none was ever entered into evidence or tested in an adversarial proceeding.
The Court's contention that the goals of retribution and deterrence are not served by executing murderers under 18 is also transparently false. The argument that "retribution is not proportional if the law's most severe penalty is imposed on one whose culpability or blameworthiness is diminished" is simply an extension of the earlier, false generalization that youth ALWAYS defeats culpability. The Court claims that "juveniles will be less susceptible to deterrence," because "`(t)he likelihood that the teenage offender has made the kind of cost-benefit analysis that attaches any weight to the possibility of execution is so remote as to be virtually nonexistent.'" The Court unsurprisingly finds no support for this astounding proposition, save its own case law. The facts of this very case show the proposition to be false.
If we took the Court's directive seriously, we would also consider relaxing our double jeopardy prohibition, since the British Law Commission recently published a report that would significantly extend the rights of the prosecution to appeal cases where an acquittal was the result of a judge's ruling that was legally incorrect. We would also curtail our right to jury trial in criminal cases since, despite the jury system's deep roots in our shared common law, England now permits all but the most serious offenders to be tried by magistrates without a jury.
(c) 2005, Knight Ridder/Tribune Information Services.
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