Destruction of school property < Violence. Violence in any form is unacceptable. Every place of employment has work place violence prevention. They will and I have fired people (normally both parties) for even suggesting that their might be an issue. The sooner kids learn that the better off they are. Now for the learning part.....
Parental Involvement. Plain and simple. Good parents set boundaries for their children. Remember back in the day....you didn't fear the teacher (ok maybe the wrestling coach / teacher) but you feared going home the most. My dad would light me up.
My children say and do things that make me cringe but they also know where the line is drawn.
Be involved and stay involved. If my kids hate me.....I've done my job as a parent. You can't be their Facebook friend and their parent. Oh sure...some kids are mature beyond their years but for the vast majority, they simply needed rules, guidelines and ENFORCEMENT. And by enforcement...I mean take away their beloved item or spank their a$$.