Some communities there are literally calling for the annihilation of Ukraine
https://programming.dev/comment/1999097
edit: Since people are either willfully or otherwose are missing my point, this is a pro-russia, pro-fascist hate group, therefore we shouldn't give them the platform to spread their shit. this is not about me seeing their community or then causing issues accross other communities, it's about de-platforming fascists.
Everyone should be allowed to be given a Platform including Fascists. If you Defederate them they get looked in there Bubble and you reaffirm their believes, meaning that there aren't any people anymore to challenge their Believes. Which is just going to make them more extreme.
This assumes they'd argue in good faith. They don't