Earlier quoted context omitted.
I think a lot of people over-estimate the resilience of the human emotional state, especially their own. Time and time again we see regular functioning adults get sucked into objectively insane or self-harmful communities, be it the above phenomenon or 4chan crap like QAnon.
I have my own share of mental issues, but I just have a hard time seeing how I could ever get involved in one of these groups, much less believe the bullshit they are spouting. What is the situation that makes these seem like a solid choice?
For a long while I was fascinated that people could get caught up in cults. It was very much not the kind of thing I would fall for. So I read a bunch of memoirs from people who had left/escaped cults and eventually it made a lot of sense to me. I would still never fall for one, but I can see how they take advantage of basic human drives and the weaknesses of their particular kind of victim.