Eg the entire European concept of "social democracy" came about through unions doing non-violent strikes in the early 20th century. Sure, there was some violence here and there but no armed insurgency. They tried it armed in Eastern Europe and look where that got them.
I know less about American history but it is my understanding that equal rights for people of colour, various sexual preferences etc all came about through non-violent protest (not the abolishment of slavery, obviously, but I mean after that).
Comments like yours share the shit out of me. "oh, well, many thousands will have to die ¯\_(ツ)_/¯"