[rebuilder]

It would really be great if privacy and anti-censorship advocates could solve the problem of extremism! Seems like a bit of a tall order, though.

What you're really proposing, IMO, is this:

Privacy and anti-censorship advocate (PA): I think we're throwing the baby out with the bathwater when we're trying to curb extremism by requiring messaging services to police their users. The problem is real, but the methods being used to address it are completely antithetical to the fundamental principles of free societies. I want to let people talk to each other on-line without anyone listening in on them or stopping them from saying whatever they want to say.

You: OK, you can do that if you can make sure no Nazis can use your service to further their agenda.

PA: That seems impossible, given the goals I've stated. Furthermore, this is precisely what I meant with "throwing the baby out with the bathwater."

IOW, I don't think there's a technical solution to be found here. This is a fundamental ideological divide, and needs to be dealt with as such.