Black, white or flying purple people eater, everyone has a choic to make. Live peaceably by the law, or live outside of the law. If your child is headed to the outside of the law side of life (happens to both black and white), now is the time to change his environment and give him/her some extra training.
Some parents say I can't do that, I have a job, and I have to make a living...Well, you made your choice, your job and making a living is more important than your child??? or not.
Yes, when they are the age of majority you cannot force them to move with you, but then you have to accept what happens.
BTW: personally, I blame social welfare for things like this...through it they learn no respect for anothers property. If not the individual, through his "buddies"...