Defederate them for having a different political worldview? Defederation is supposed to be for extreme circumstances. There’s not a problem that .ml communities cause of people breaking the rules here. I’m not saying there aren’t toxic people from lemmy.ml or lemmygrad.ml, there definitely are, but there’s nothing to justify defederation.
If instances just start defederating other instances for hosting a lot of communists then the platform’s gonna fall apart lol.
You can block instances if you don’t like them. You don’t have to decide what the best experience for all us other lemm.ee users is.