My experience on the Fediverse is actually directly opposite yours: there is a whole host of explicitly right-wing instances to the point where a lot of other instances filter them out through blocklists. It it also my experience that a good deal of Mastodon instances tend to be left-leaning (as a result of per-instance rules/moderation practices) and a good deal of Pleroma instances the opposite. Of course there are exceptions here, but it's really not hard to find right-wing instances on the Fediverse. In fact, to find them you only need to browse popular blocklists[0]. There is nothing preventing you from signing up to one of those, though I think it's fair that I warn you that they're not the kind of instances you'd want to spend much time on for your own sanity.
Disclaimer: I'm sympathetic to a lot of the "leaning to the left" practices you name, such as calling people out and the issue of complicity by voting to maintain the status-quo.
The only person using the phrase "evil totalitarian fascism" is you. It's entirely reasonable for an instance owned by a private individual to have higher restrictions on what they permit than the US does. Most countries, as a matter of fact, also have more restrictive policies.
Opting into using the blacklist is just that - an option, and you can customize the list as you please on your own instance. There is no problem here.
No. If a server admin does not use that block list, they are excluded from the larger (original) Mastodon community. So every instance is effectively bullied into also using the block list if they want access to the largest fediverse. Otherwise others won’t federate with them.
This kind of nannying makes for an incredibly depressed and not-fun space. Twitter is a fun space precisely because of the possibility of altercations with those that disagree with you.
I think the world has spoken in this regard (based on user and usage volume). People prefer more speech as opposed to less speech. Echo chambers / hive minds are boring and oppressive.
Disclaimer: I'm sympathetic to a lot of the "leaning to the left" practices you name, such as calling people out and the issue of complicity by voting to maintain the status-quo.
[0] https://github.com/dzuk-mutant/blockchain