Earlier quoted context omitted.
> We've replaced religion and witches with aliens, new age beliefs, flat Earth, reptile conspiracies, etc. I think you are understating the problem. Aliens, new age beliefs, flat Earth, reptile conspiracies, etc. are fringe beliefs in our current society, and are recognized to be fringe beliefs. Religion and belief in witches, in the societies you are referring to that had those beliefs, were not fringe beliefs; they…
> For example, in Salem, Massachusetts in 1695, people who said witches did not exist were the ones who were believed to be on the fringe. Indeed, but those people were highly religious Puritans that emigrated to the New World because they were prosecuted in England. https://www.history.com/topics/colonial-america/puritanism When you put those kind of people in isolation and a high stress situation you get those kind…
The Puritans were by no means the only people of that time who had mainstream beliefs that we now consider delusional. You'd be hard pressed to find any significant body of people of that time who didn't.
> For example, climate change denial.
I would also say, climate change alarmism. Which, if you are inclined to disagree (you might not be, I don't know, but I suspect at least some people reading this will be), illustrates another aspect of the problem: it's hard to improve mainstream beliefs when there is not general agreement over how to improve them--which new beliefs should take the place of the ones that are claimed to be wrong.