At what age does one learn difference between right and wrong?

By a five to four decision, the U.S. Supreme Court decided murderous scum can not be executed by the state if they were under 18 years of age when they committed the crime in question. The test case was this one:

Christopher Simmons kidnapped a neighbor in Missouri, hog-tied her and threw her off a bridge. Prosecutors say he planned the burglary and killing of Shirley Crook in 1993 and bragged that he could get away with it because of his age.

This guy was 17 when he killed his neighbor and 28 now. If he doesn't rate the death penalty no one does. Kids much younger than Simmons understand the difference between right and wrong. They know murder is wrong. However, five of the idiots on the Supreme Court don't feel kids can figure that out until they're 18. I can accept someone (incorrectly) believing that the death penalty is wrong no matter what. I can not understand making a distinction between a 17 year old cold-blooded killer and an 18 year old cold-blooded killer.

AND ANOTHER THING:

This same Supreme Court has declared that innocent people can be murdered up until birth but the GUILTY can not be punished if they choose to commit their crime prior to reaching their 18th birthday. What morons.