If he is still under 18 then you have to tell someone and they shouldn't let him go until he is sorted out and has little chance of returning to his current state, if he is over 18 you have to call a help line or the police, I think prison sounds drastic but if you think it is the best option, do what you have to do to help him.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.