https://cup.columbia.edu/book/why-civil-resistance-works/9780231156837/
This is the work that's often being referenced when talking about non-violent vs violent resistance, and the 3.5% participation claim.
I don't see any references for your claims either.
Which of these 23 links backs up the claim that "people only respond to violence," or, paraphrasing, non-violent resistance is ineffective?
I tried to skim a couple, but the synopsis on one was simply a recounting of black power tactics from the 70s, and another was a wiki page about the radical flank effect, which actually referenced the book I linked to support the claim that having a violent radical flank appeared to have no positive effect. Other references sometimes found a positive effect, but I can't really compare the merits of the sources.
Honestly, having a pile of obscure links to whip out in favor of political violence is, at a minimum, odd.