Thompson v. Oklahoma
JUSTICE O’CONNOR, concurring in the judgment.
The plurality and dissent agree on two fundamental propositions: that there is some age below which a juvenile’s crimes can never be constitutionally punished by death, and that our precedents require us to locate this age in light of the ” evolving standards of decency that mark the progress of a maturing society.'” See ante at 487 U. S. 821 (quoting Trop v. Dulles, 356 U. S. 86, 356 U. S. 101 (1958) (opinion of Warren, C.J.)); ante at 487 U. S. 827 -829; post at 487 U. S. 864 -865, 487 U. S. 872. See also e.g., McCleskey v. Kemp, 481 U. S. 279, 481 U. S. 300 (1987). I accept both principles. The disagreements between the plurality and the dissent rest on their different evaluations of the evidence available to us about the relevant social consensus. Although I believe that a national consensus forbidding the execution of any person for a crime committed before the age of 16 very likely does exist, I am reluctant to adopt this conclusion as a matter of constitutional law without better evidence than we now possess. Because I conclude that the sentence in this case can and should be set aside on narrower grounds than those adopted by the plurality, and because the grounds on which I rest should allow us to face the more general question when better evidence is available, I concur only in the judgment of the Court.
I
Both the plurality and the dissent look initially to the decisions of American legislatures for signs of a national