As a thought experiment, I'm going to throw out the worst possible analogy I can think of: How should historians deal with holocaust revisionism?
Is it better to censor, criminalize, and ignore the deniers, or should their claims be refuted with discussion and evidence (if available)? Ken McVay and the Nizkor Project has been doing this with holocaust revisionism since the USENET heyday of the 1990s. Refutation of claims from revisionist texts is openly presented by Nizkor.
Open dialague hasn't proven to be horribly effective, but marginalization and not responding openly to skeptical claims is certainly less effective. Humans are social animals. We need to interact and talk, even if it sometimes seems the guys on the other side of the fence are the bad ones.