> I don't believe that moderating away content and discussion of climate denial would actually result in climate change deniers changing their views. They'd simple disengage with the social networks that institute such moderation and instead seek out alternative mediums. They are plenty of other venues online and offline for climate change denying and other questionable content.

One key effect here too: Even if being among other people doesn't turn them away from climate change denial, it can ground them in reality in other areas better.