So, back to the anecdote, why in the case of someone being intelligent by your judgement would they believe this story, with ample evidence easily accessible to refute it?
- They've never considered it critically--ok that's possible - They've considered it critically and decided it's true--I'd argue they either haven't or they're not - They have developed a cognitive disconnect to protect themselves from loss of community, connection to their family, or fear of death
I am nearly certain that the last item accounts for the great majority, which is why this is such a dangerous suggestion. There is a real risk of losing your agency as an individual for of the rest of your life. I have seen this happen to many many people. I have seen many many people (literally 100s) who joined a church around when they were in their 30s just drawn in by the "community" only to become deeply disillusioned now in their 60 and 70 and feel that they had lost or wasted their youth and full of regrets. These institutions have spent thousands of years refining techniques for manipulating people, and their preferred primary prey is children and 30-somethings who feel "lost" exactly as the OP describes. They literally produce videos and training materials stating such.