Earlier quoted context omitted.
I'm not saying we're there yet, but, at the risk of waking Godwin, at what point in 1930s Germany would violent protest finally be OK? We'll start at "Never," and work back from there.
The 1930s were full of violent protest - running battles on the streets between gangs of thugs on both sides (red vs Brown shirts). It helped Hitler portray himself as the law and order candidate. Peaceful but overwhelming mass civil disobedience and protest is better. The time for that is now.
And I'm hoping we never reach the need for more than that.
As for violent German protests, I'm pretty sure taking away those violent opposition protests would not have prevented Hitler from taking power. Perhaps they needed more violence. And indeed they eventually did get more violent opposition that did defeat them, by the West's armies.
Perhaps more violence in the thirties might have prevented WWII.