It starts with the parents. My son is 10, has been playing T rated games since he was 8. I check the games out and see if it is appropriate and decide there. He plays Destiny, i dont allow him to use a mic or join a fireteam when he does. Only M rated game he plays is Arkham Knight. He is by no means a violent or angry kid. I agree that kids shouldnt do mailbox baseball,due to it being dangerous and very illegal. An a no to egging cars as well as punching holes in walls. My kid stays out of trouble. Makes 1st honor roll every grading period and is active in sports all year. So my point is, It all is on the parents to teach the kid right and wrong. Hug them, praise them. Explain the situations of life.