Earlier quoted context omitted.
You're being rapidly downvoted but to play devil's advocate I wonder if you could explain why you think "American leftism" is "disturbing".
For the same reason all the orthodox authoritarian ideologies are disturbing. Why would I want to join an online discussion forum where free thought isn't welcome? Having "leftist" in the description makes people (at least myself) automatically jump to the conclusion that one can get cancelled/banned/deplatformed for posting any thought or argument that disagrees with the mainstream. I'm not a conservative or anti-va…
Every community has ideas about what's right and wrong, and there will always be people who disagree. Moderation will always be required because that's just the nature of communities.
> Politics aside - I wonder if it would be possible to create an instance focused on free speech, without automatically attracting all the worst people?
To the point I just made: no, it's not possible refrain from moderating a community and then avoid having people there who engage in behavior you don't like. If your definition of "free speech" includes a complete lack of moderation, then you'll always run into this problem.