Educating people works. I mean, it's better if they aren't indoctrinated or wrong to begin with. Failing that, I do have to respect people who are presented with evidence they hadn't seen, or had just been taking peoples word for it, and have the courage to actually change their minds publicly.
It's why I'm not in favour of "they're all stupid". I wouldn't always disagree, but it makes it harder to reach people and change their minds.