AI Weiwei holds silent protest outside Julian Assange's extradition hearing
smh.com.au
smh.com.au
And because those protests are non-violent, and almost always the protestors suffer. They get the moral high-ground and people believing in cause rally around the protest and not extremist who want to burn down something.
Imagine any example I gave was a violent protest ending up as bloody conflict. How would any of them end up?