Violence is not binary. A light slap in the face can be very beneficial for snapping hysterical children out of tantrums. This is proven! Caning people for mistakes humiliates them, and creates in them, the desire for vengeance. Violence at that level, breeds violence. They will hit their children, who will hit their children in turn, and on and on it goes. This is also proven!

I say, remove the naughty children and put them in work/vocational training. Life will punish them enough, later on, if they do not change their ways.

Another way is to punish the parents of naughty children. They are, ultimately, responsible, and if they raised bullies, they should be punished.