There were peaceful protests in Germany. Nobody had a problem with those.
Nobody? Really? You don't think the right-wing Springer press (just to name the most glaring example) that is ideologically allied with ultranationalists in Israel had a problem with those? That they wouldn't have cried foul even if the protests where utterly devoid of any radicals? That they wouldn't have tried to censor even your imagined peaceful protests?
I have big sympathies for FireFish, but I feel like the target audiences so far are very different. Maybe call it the network effect, but it's difficult for me to imagine a tumblr user who maybe is used to blogging about their SuperWhoLock fandoms moving to FireFish where there probably is no big audience for that. At the same time I would want to see these users and their niches in the Fediverse.
There is a very particular culture that is unique to tumblr which I don't see moving somewhere else.