Sure, but the goal here is not necessarily to eliminate hate-speech entirely, since that is obviously impossible; the goal is to make it hard to find. You do that by not allowing hateful communities on your website. I don't want an impressionable teenager, for example, to get sucked into a fascist echo chamber on the same sites they use to talk about video games. That was (still is?) a huuuge problem in the YouTube gaming scene.
Ideally there would be systems in place to stop the fascists from creating their own echo chamber instance, but I understand why people would be scared of that power being abused. So fine, let them then. But they should never see the light of day.
Genuinely - if you do not think this is effective, how do you think we can deal with extremism effectively?
Definitely, and that is one of my main fears/critiques of this whole fediverse thing. Ideally there will be a system in place to help mitigate that, if there isn't already. Defederating is also effective.
I guess my point is that any instance (or website in general) that was not started with the inherent goal of being a fascist echo chamber should be completely intolerant of fascist/bigoted ideas. Especially the big ones, like lemmy.world and Kbin. And they should do everything within their power to not let those ideas exist. The paradox of tolerance and all that.
Some people are too far gone and will just run away into the shadows, sure. I'm more concerned about the "regular" people who are exposed to those ideas against their own will and get sucked into this cycle of hatred.