I will repeat that someone in this guy’s family or anyone with any real contact with him, knows there was something wrong and did nothing. Sometimes even knowing doesn’t help. I have a personal story on something similar, (not mass murder) we’ll just call it a bad seed. I’ll tell you he was in and out of juvenile his teen and pre-teen years. Everyone in his family knew he was bad, but even jail didn’t help. He was up for parole and his biological mom warned them not to let him out. They did anyway and he committed a heinous crime and will spend his life behind bars. Even our checks and balances don’t protect us.
The problem with shrinks getting involved is that they think they can medicate anyone into normalcy, and they just about can. The problem is when the self medicated patient forgets to take his pill, or he ran out. There used to be a place for these folks. It’s called Rusk. Now, they are roaming the streets among us. The ones not medicated yet have huge numbers and are just waiting for something to click. It’s very scary.