> We need both violent and nonviolent forces, but we're not permitted to say that out loud. But historically, thats what works.

[citation needed]

There are multiple studies and books that go over how the less a movement uses violence the more likely it is to be successful:

* https://www.goodreads.com/book/show/44096650-civil-resistanc...

* https://global.oup.com/academic/product/civil-resistance-978...

The above book has a chapter about how if a movement is non-violent, but a contingent/faction wants to use it, various ways to handle it.