[user104658]

To be fair, I have my doubts that a child who has been raised almost to their teens in an environment of engaging in such violence will ever be totally psychologically "normal". But then again, there are accounts of African child-soldiers who are forced to do horrific things (and often stuffed full of narcotics) going on to live peaceful adult lives after being rescued from the clutches of warlords. So it's possible. Secure psychiatric care would probably be more appropriate than prison. It really would have to be very long term though.