Well, having gone to school in Compton, I can tell you violence there was pretty bad. We've had what could be described as riots. Sadly, most of it was due to kids being inducted into gang affiliation. Most of the time when they do something as idiotic as joining a gang, it's to become popular or to garner "respect". Which ironically, my people will never gain until we stop the gang-induced genocides amongst our selves.
But back to the schools. It's a damn shame that those people are ruining their educations just because they get into little scuffs. I would guess the same as Jack, the economy adds a lot of stress to everyone, and it probably has many people just barely teetering on the edge of insanity.