After they get out of the I.C.U., and after the broken hands and legs heal, if i were their parents, i would make them sell everything they have at a booth in front of the biggest mall in town with a sign behind them stating "this is what happens to you if you are a punk kid vandal" with large pictures of the cars and their injuries. All of the money goes to the people who's cars were vandalized.
Next is to make them polish the rock with their balls until it's a grain of sand while listening to the Dead Kennedy's song "Holiday in Cambodia".
Then i would make them join the military so they would learn respect and order in their lives.
Killing is too good for them. Jail won't prove nothing to them. Councilling is a joke. Community service is a waste of time.
Beating, humiliation, and discipline is the only way to change them.
F***ing idiots.