Have there been cycle breaks? I'm not trying to be combative but I am curious to know what examples you have in mind. I don't think human history has ever seen a break in the cycle of violence as I would define it. The active bloodshed has waxed and waned over the centuries, or at least moved from place to place, but violent oppression has been alive and malignant in every chapter of human history that I can think of.

That's a hard question and I don't know. I don't know that a strictly nonviolent movement can work if there's a critical mass of oppressors who believe that those they oppress deserve to be oppressed. I think the theory of nonviolent resistance is built on an assumption that, deep down, we all know that what oppressors do is wrong and that there is a contrivance of convenience that allows oppressors to except themselves, or simply ignore that knowledge. I don't know if that deep down knowledge is universal. But I know from personal experience it's quite easy to ignore it, especially when one's own life is hard, or when the oppression is mostly hidden from view, or simply when the problem of oppression seems overwhelming and unassailable. I believe that most people who don't try to resist oppression either disapprove but feel helpless in the face of it, or they benefit from it and therefore try to justify it, or usually a combination of the two. If that belief is correct, then the answer I think is one of education. Give people the tools they need to fight nonviolently: Educate about local elections, form citizen watchdog groups, show how propaganda uses common tropes to reinforce ideas about the "inherent criminality" of the oppressed, teach the history of how oligarchs use flunkies like trump to implement favorable policies while deflecting blame onto minorities, and the million other things that people need to know to have a well functioning society. Use shame to dislodge the privileged from their comfortable niches and force them to answer for the consequences of their actions or lack thereof.

I think, especially now in America, this seems so far away that even to seriously consider it seems fanciful. Maybe it is. Maybe we're at the point where violence is necessary to jerk us back from the cliff of autocracy. It certainly seems like trump and his goons want a fight, and it seems likely that sooner or later they'll get one. But I don't think violence can be solved with violence, and even if America goes through some violent convulsions I don't think they'll end us in a place where we aren't doing violence to each other. Nonviolence requires nonviolence.