Question comes as a kind of addition to one I asked awhile back. It was about having met a truly evil person. I can tell the story again if anyone is interested but as a young teen I interacted with a guy in the Aryan brotherhood from California several times.
a) most of the time you actually don’t want to know. You take precautions with everybody, half the time knowing just makes it harder to pass dinner trays.
b) they also just. hire brand new adults with highschool diplomas. give them a two week crash course in psychiatry. then just. “Here’s the criminally insane men!”