[JohnnyZ]

What age is too young then? 8, 9 years old? Little Timmy hits his little sister with a bat out of anger and kills her.. Does the court system kill him too?

That's ridiculous. We have a jury system to take that into account. The under-18 killers were found guilty and sentenced to death because they deserved it. Plenty weren't sentenced to death.

[Chaguito]

Exactly. The SC has nullified the judgment of juries and has nullified the judgment of 19 state legislatures, all on the basis of the interpretation of a word "cruel." It's not so much a "liberal" mindset as it is a "bureaucratic" mindset - the goal is to remove any notion of thought/reflection in decision-making, replacing it with a ruling.