There isn't really a good solution here. A precedent for banning speech isn't a good one, but COVID was a real problem and misinformation did hurt people.
The issue is that there is no mechanism for punishing people who spread dangerous misinformation. It's strange that it doesn't exist though, because you're allowed to sue for libel and slander. We know that it's harmful, because people will believe lies about a person, damaging their reputation. It's not clear why it can't be generalized to things that we have a high confidence of truth in and where lying is actively harmful.