Because most people simply are not killers.
I am not sure what your point is. By definition this thread is about individuals that murder. The subject is, should those that murder be executed (regardless of age).
The Surpreme Court just ruled that you get a pass until your 18th birtday, I happen to think the circumstances rather then an arbitrary date of birth should decide if an individual deserves the death penalty.
I support the death penalty, I can suppose you don't. We will just have to agree to disagree.
I can gurantee you one thing. I will gurantee one of these young men let off of death row will one day be let out of prison, and he will kill another innocent person, and the blood of that person will be on the hands of the justices that allowed him to walk free.