> You can't stop online stupidity and misinformation with censorship

Shame and ostracisation handled this through antiquity. There is no evidence introducing those elements online cannot work.

> would at best create an echo chamber of government supported online stupidity and misinformation

But that’s what we got anyway.

It’s just as clearly the case that a lack of regulation amplifies people willing to be stupid online. Taking that amplification away takes us back, per your worst case, to what we have now.