The alt social media are a good place to run away from algorithms and explicit mass manipulation from other big tech, be more free, independent, and spread ideas, but I also think that the fediverse is being filling with people with radical political ideologies, some kicked out of traditional social platforms for this same reason. I’m not saying that we can’t have discussions, but I think that many people are making their own echo Chambers in the fediverse.
The fediverse isn’t really a special entity in this regard. By it’s very nature, the Internet itself can be used to build & operate silos of just about any sort, and people have been dreaming up ways to do so for quite some time.
Most of the fediverse platforms have ways of dealing with radicals, or dangerous people, misinformation spreaders, white supremacists, what have you, which are pretty effective, especially if administrators and moderators do their thing in bulk. There’s obviously some challenges where people put up their platform, allow everyone and their dog to use it, and then abandon managing it, leaving it to rot in the hands of spammers, criminals and low lifes.
On the whole, though, I don’t think “the fediverse” is necessarily making for a safe space for such nonsense - those types gets blocked, filtered, shunned, isolated, etc, just as moderation intended. If they’re criminal, they can be reported to their respective network, web and DNS service providers just like any other entity online.