There was recently a story of someone whose kid died of measles, but they were still anti-vax in the interviews afterwards.

There are two main ways people change their mind. One is in-group pressure. If your friends and trusted people are telling you a thing, you’ll probably believe it. None of us are immune to this. Who you consider part of your in-group varies- some people fall for celebrity endorsements more than others, or view bad sources like Fox News as trustworthy.

The other thing that can change people’s minds is trauma. If you’ve been an anti-climate-change guy and your house gets destroyed by a freak super hurricane, you might reevaluate. Maybe. Of if a big KKK guy gets hit by a car and left a dead, and a black guy saves your life, they might reevaluate.

But there’s no guarantee.