To expand on that, it’s about community and finding people who share your interests. The movie Behind The Curve explores this idea and it’s quite revealing.
Jeran from Behind The Curve was one of the ones to flip, and since then, he's been making videos on how the earth is actually round.
He has a lot of thoughts on what it actually takes to convince other flat-earthers. I found it somewhat interesting: https://www.youtube.com/watch?v=1grMf17PeEk
It's implausible, yet that's what stimulates the tribal feelings among the believers.
Makes me think that mr trump switched from being democrat to republican and pushed for magaesque folks who often love him to the death due to very similar principle - just spit out some populist crap that stirs core emotions - the worse the better, make them feel victim, find easy target to blame which can't defend themselves well (immigrants), add some conspiracy (of which he is actually part of as wall street billionaire).
Extreme left wouldn't swallow easily that ridiculous mix from nepotic billionaire who managed to bankrupt casinos and avoided military duty (on top of some proper hebephilia with his close friend mr E and who knows what else).
But what do I know, just an outside observer, but nobody around the world has umbrella thick enough that this crap doesn't eventually fall on them too.
I've heard that even Hitler was like this: that he didn't start out hating Jews, but repeatedly reacted to the fact that he got louder cheers whenever he blamed things on Jews. But I don't know how to verify if this is true.
https://www.thehistoryreader.com/historical-figures/hitlers-...
Unfortunately, the climate change deniers in all their forms have made it much further by having support in politics and having a real impact on people's lives. In contrast to flat earthers.
Just the mere fact that my post here could be interpreted as political (which it really isn't) is evidence of this.