I think most of what anti-vaxxers say is nonsense and harmful. However, I think most of what Christianity, Judaism, and Islam say is nonsense and harmful. Same for Keynesian economics, Marxism, and nationalism. Indeed, so much of the populace is afflicted with idiocy, ignorance, and irrationality (sometimes, maybe even me!) that I'm wary when one group tries to de-platform another. What if they're wrong?