I find it quite amazing that you question the morality of a temporary act of political demonstration against the agency responsible for setting rules directly related to the means of that political demonstration, and then suggest that parents should have violently abused their children to get any thoughts of such political demonstrations out of their heads.

Frankly, if my son suggested a means of demonstration as outlined here, I'd reward him for it. If he suggested violence against kids was ok, on the other hand? He'd never hear the end of it.