In general, I don't agree with this. However, after reading a couple of prison experts argue that prison gangs, and most prison violence could be eliminated simply by reducing the size of the prisons. They argue that prison gangs are a rational response to the inability to make prisons safe for prisoners, and that inability is simply a question of prison size.
I wonder if a similar effect isn't present in modern public schools. That above a certain size it. becomes impossible to maintain an environment which is physically and psychologically safe for the students.