For whatever it is that they did to those kids to make them that way. It would take a little snooping around and I'm not suggesting we start arresting parents on the mere suggestion of abuse but people don't just get born evil, or good for that matter. You have to raise them that way.

You show me most any serial or mass murderer and I'll show you a childhood chock full of abuse. I'm just playing the odds that if you look at how those kids were brought up, you'll find a closet with more skeletons than those kids had guns. A person who does that to a kid, ought to be punished.