let’s pretend lemmy was heavily conservative instead of liberal making this exact post.

I think you misunderstand the issue, so as you mentioned conservative, let’s illustrate it with an analogy.

The situation with lemmy.ml right now, and apologies for the reddit analogy, is the equivalent if on reddit the batshit crazy mods of formerly /r/the_donald or /r/conservative could ban you from /r/linux because you said something bad about Trump on /r/memes. At that point it’s not about dissenting opinions, it’s about them wielding power they shouldn’t have over those dissenting people.

An instance that operates like that shouldn’t be part of mainstream lemmy and host general purpose communities. The only way to take that power from them is to shun them, i.e. defederate.