Hexbear oppose Putin while frequently talking about theory and communist philosophy. There's barely a single popular post that doesn't at least reference leftist theory. You clearly are just talking 100% rubbish.
My bet is on you having been banned there for being some form of ass. Just because that seems to always be the case.
Like it or not, the reality is that regions in the East of Ukraine were very much on record as supporting Yakunovych, and closer relations with Russia, for decades. There's only one reason the Minsk agreements fell through, and it's because they did not want to give eastern regions autonomous votes.
If the other half of your country coup'd your president, half-outlawed your language and ignored the political will of your half of the country, you might have a right to be upset and label that suppression.
This is not what "so many of them support" and I know you cannot source a popular post to prove otherwise because it doesn't exist.
Hexbear oppose Putin, they just also recognise Ukraine and NATO also behave very shittily, sometimes moreso. There's a recognition that the west have gleefully egged on this war at the expense of innocent Ukrainian/DPR/LPR/Russian civilian lives.
When someone is banned, their posts are automatically deleted, it's not some crazy admin obsession to 'purge your entire history'.
This story does appear to be "an admin abused their power to ban me, then that admin got banned for being caught abusing their power". Which is not uncommon in online communities.
I think this is probably the fairest description. Hexbearians are dickish trolls sometimes. Unfortunately, because Hexbear was the biggest Lemmy instance for the longest time, a lot of communities found this initially overwhelming, plus the big jump in political perspective is too jarring and can seem nonsensical.
But I believe anyone who takes a moment to engage in good faith with the cool users, and ignore the trollish ones, will see you can have constructive, interesting and caring discussions and realise what the attraction of the community is.
Mao introduced some terrible measures, for sure, but it's a long shot to say he's "Responsible for" every death or imply it was at all deliberate. Famines in China were more widespread and frequent pre-Mao.
This is objectively untrue, Lemmy.world refused to ever federate, as, in their own words, a "pre-emptive last resort".
In their statement, the reasoning they explicitly highlighted was Hexbear's stances like being against western propaganda and disliking the mass overseas wars driven by the US. Don't believe me? You can read it here - https://lemmy.world/post/2498330
So no, Hexbear was very explicitly defederated because of politics.
This analysis isn't quite accurate. On the whole, Hexbear is actually one of the kindest and coolest and community-minded places I've ever been on the internet. But I'd agree there's an issue of a portion of users who happily get overly aggro if you annoy them (and being allowed to get away with it).
Hexbear has plenty anarchists. Left unity is a strictly enforced rule and has like 20 dedicated emotes.