When one has been persuaded of an extreme view there is a danger of over-reacting in the opposite direction and turning to believe everything that is said against it and also against less extreme versions of the same view.
I wouldn’t call Mark Heyer’s answer to With global warming and coastal flooding imminent, should major coastal populations start relocating now? – Quora fanatical, but it does show the beginnings of turning from a gullible supporter of one view to become a similarly gullible supporter of its opposite.
In particular it seems that Heyer has gone from believing in extreme exaggerations about climate change to believing in extreme exaggerations about those who consider it a risk that should be avoided. (See Israel Ramirez’s answer to Did the climate scientist James Hansen really predict that New York’s West Side highway would be flooded by 2008?)