@moss Yeah, it's "viral" in an almost literal sense: all the Cat 2s have to do is start the infection, and large numbers of Cat 3s will happily take it from there. I have no idea what to do about this on a large scale, and given the current state of US politics I'm afraid there may not be much of a chance for anyone here to do anything about it much longer. Hopefully the rest of the world will carry the torch while we live (or don't) through the plague years.

On a small scale, I've had luck with a few antivaxers by trying to be kind and patient. Same with creationists and climate change deniers. But it's a long shot: for every one I get to consider the evidence, a hundred or a thousand react with confusion, mockery, and/or rage. At this point I'm just not sure how much I have left in me to keep trying.