How exactly do you think antivaxers became antivaxers? They weren’t born like that, they were exposed to propaganda and eventually fell for it.
I know several wonderful, educated and otherwise reasonable people, who have fallen for antivaxing, antimask, covid-is-a-lie conspiracies. This includes two teachers in the public school system. The same people who are supposed to teach critical thinking to the next generation. Think about what that means for a moment.
Propaganda works. Stopping propaganda, highlighting “fake news”, debunking conspiracies, and teaching critical thinking is essential.