The very nature of the fediverse makes fragmentation part of it. Since it's not centralized, control is distributed to the different instance admins. It's only natural that people with different opinions will want to split from each other, and that's without taking into account the levels of toxicity allowed by different moderators.

Is an instance allowing racists to thrive in there? Of course it will be blocked by leftists, since banning is a concept that no longer applies.

Let me repeat for clarity: You CANNOT ban someone from the fediverse, you can ONLY defederate from them.

And don't tell me it's that much different from reddit, I've seen political subs denying access to people simply based on what other subreddits they're subscribed to.

Would you rather have a single hierarchical "network" where an asshole dictator decides who is and who isn't allowed to post? Of course not, otherwise you wouldn't be here.

Federation implies defederating instances you're not comfortable with.

And that's perfectly fine, because safety comes first.

My freedom of association necessarily implies that I'm free NOT to associate with people I don't like, and my insurance admin should be able to make sure I'm free from harassment by those same people.

Want to solve this issue? Solve human nature first.