Free speech has never been perfect. Heterodox ideas are often wrong, and sometimes those ideas have a cost. But sometimes, heterodox ideas are right, and absolutely crucial to us making progress. The latter category of ideas is the main reason why we have free speech. But, it's not so easy to discern the heterodoxy we need from the heterodoxy we don't, and it is far too dangerous to entrust anyone with that responsibility. It is very easy to suppress important information by accident, and obviously very easy to do so on purpose.

Facebook has already demonstrated the danger of censorship, their own incompetence, and the flaws of relying on orthodox-aligned sources. Up until recently, they were suppressing the lab leak hypothesis. That hypothesis is now considered plausible.