Hell, Justice Kennedy -- why don't we just review all of our state laws in light of the prevailing views of the U.N?
Last time I checked, the Court is only supposed to construe state statutes in light of principles and text of the U.S. Constitution and U.S. Treaties.
Isn't it obvious why? The country is becoming more conservative. So he repairs to other fountainheads of trendy liberalism to refresh his own bias, and deploys citations of United Nations paper against our own organic law.
"The practices of other nations, particularly other democracies, can be relevant to determining whether a practice uniform among our people is not merely an historical accident, but rather so 'implicit in the concept of ordered liberty' that it occupies a place not merely in our mores but, text permitting, in our Constitution as well. See Palko v. Connecticut, 302 U.S. 319, 325 (1937) (Cardozo, J.)." -- Justice Scalia, Thompson v Oklahoma (487 US 815)
Damned liberals.
Congress could easily put an end to such shenanigans by passing a law saying it is illegal to use foreign law to interpret the Constitution--that any attempt to do so makes the interpretation null and void, and the attemptor, by his act, a traitor.