If you want a more-politically-censored environment, I guess you could try beehaw.org. They tend to enforce positivity and restrict some political stuff and are into creating a “safe space”.
We want to explicitly make a nice little corner of the internet where we can hide from racist, sexist, ableist, colonialist, homophobic, transphobic, and other forms of hateful speech. We want a space where people encourage each other, are nice to each other, are supportive and exploratory and playful.
It’s not really what I’m looking for in a home instance, and there’s a limited amount of activity there, but I’ll give that they seem to have a userbase that seems less suicidally-depressed than some other home instances on the Threadiverse. Note that they have defederated from lemmy.world, as they don’t feel that it fits with their policies, so you’ll have more-limited access to content than on most home instances. Also, I remember seeing that they were considering moving to some non-Lemmy platform (Pleroma? Can’t remember), so if you specifically want Lemmy, that might not work for you if they do such a move.
EDIT: If you take your requirements literally, I think that you’re going to have a hard time finding an existing instance that will fulfill all of them. Beehaw.org might be closer, but it’s just not going to get you that far. Like, you said that you want an instance with no libertarians. I lean right-libertarian, so any instance that I could use would already be violating your requirements. I think that such an instance would probably need to require users to up-front state their political views at registration time so that that information would be available, disallow users with banned political views from access, and only federate with a small, whitelisted set of instances. The closest thing to that, where I think you have admin-level policing of political views, is probably on the tankie-oriented instances, and you’ve also said that you object to tankies.
You could set up an instance yourself and only federate with a carefully-curated set of instances that have similar instance and federation rules. But that’s also going to obviously seriously limit the content available. Maybe hit !newcommunities@lemmy.world and try to promote it to any like-minded users.
The apps don’t do anything useful if the government blocks connectivity to the servers that the software needs to talk to at the national network infrastructure level.