That's the part that gets me. Like, I'm all for "it's your server do what you want," but I do judge you if your reason for defederating my server is something so stupid as "this other server says they're bad, so I'll trust that."
You fools ain't never had a friend spread a runor about another friend? Never watched a sitcom? People lie lol, if you're going to make overarching decisions that affect your users too, you could maybe stand to do a modicum of your own research into it instead of just letting the one you "trust" bully you into compliance simply because this other masto instance doesn't cater specifically to marxists, and "capitalists are nazis" so they must be banned or else they'll speak!
My masto server is defederated for being anti trans, yet one of our organizations key members has been a trans woman since 1981 and she's one of the most prolific posters on the server (and one of the best, I might add). We're labeled "anti trans" simply because we didn't defederate with a server that is actually anti trans when the "good guys" tried to bully my admin into it, but the admin respects us enough to allow us to make our own decisions regarding what we want to see or not see on our feed, so of course that suggests to these reactionaries that he wants to somehow exterminate the jewish people.
I'd be more open to it frankly if I wasn't a direct example of how that system can be and is being abused to create echo chambers and bully those who don't want to live in them. By all means, your server your right to do so, but my right to think you're a bad person for it if it's for silly unresearched reasons such as this. And you might say "they don't have the time to investigate everything, so they just throw the book at it." Well, they chose to become admins, they chose that job, maybe managing a public server just isn't for them, I know I don't have the time, that's why I don't do it.