I can know "this doesn't work" without knowing exactly what does work. "Violence is the only tool we have, so we have to use it" is the sort of logic that leads to the Holocaust.
If you want my own personal observations: Over the past few centuries, we've managed women's suffrage, black suffrage, gay marriage, etc. largely without violence, so clearly there are processes out there for progress. We fixed the Ozone Hole without killing people. I don't think murder was involved at all in finding recent AIDS medication, or GLP-1.
There are tons of examples of successful social progress in the past few decades that don't involve violence. Conversely, I struggle to name any terrorists that accomplished their goals by bombing scientists.
If nothing else, we can make violence a lot more legible by embodying it in a legal process, and bringing society onto the same page about it's necessity.