These little animals must have some world class parents. But at least they raised them stupid, too, as evidenced by the decision to video their deeds and put it on youtube or myspace. That even outclasses some of the criminals who’d victimize someone, then use their cell phone for days.
These little winches should get Darwin awards along with adult trials and prison sentences.
It is very likely that these evil morons would simply take the place of an even more violent Perp who would be released to make room for them.
A symptom of an even bigger problem.
I would not jump to conclusions about their parents. Teens do stupid things especially in a group setting. Group influence on a teen's behavior can be an enormous factor.