

I think people’s behavior is determined much more by social conventions and the expectations of their community (in addition to pragmatic self-interest) than it is by logical reasoning. I’ll risk being the preachy vegetarian by discussing people’s attitudes towards eating meat. Most people sincerely believe that cruelty to animals is wrong, and also that factory farming (if not all killing) is cruel. Yet they eat meat. I even know some people who started eating meat again after being ethical vegetarians. Did they change their minds about whether or not harming animals is bad? No. If pressed, they feel guilty but they don’t like to talk about it. The reason they’re eating meat is because it’s convenient and almost everyone expects them to, not because they reasoned from first principles. Likewise with religion - if no one else is giving everything away to the poor and everyone will think you’re crazy if you do rather than praising you, you’re not going to give everything away to the poor even if it would make sense to do so given what you believe.
Edit: Kidney donation is another example. I met a woman once who donated a kidney to a friend of her mother’s. This person wasn’t someone particularly dear to her, but she found out that he needed a kidney to live and she gave him hers. I think that what she did is commendable, but I still have both my kidneys. This is despite the fact that I sincerely believe that if, for example, I saw a drowning child then I would risk my life to save him. People would think I was a hero if I saved the child, or that I was a coward if I didn’t try. Meanwhile almost everyone I know would think I went crazy if I donated a kidney to a stranger. My relatives would be extremely worried, and they would try to talk me out of it. I’m not going to do something difficult, painful, and (to an extent) dangerous when everyone I know would disapprove, even if in principle I think risking my life to save another’s is a good thing to do.
Here’s an incident that is only tangentially related to what we’re talking about, but it’s one that I found memorable. My grandmother was reading a tabloid newspaper (which she tends to believe) and it apparently had an article about UFOs. She turned to me and told me that, according to the newspaper, space aliens were real and visiting Earth. Then she went about her ordinary business - the thing about the aliens was simply an interesting bit of trivia for her.
I think her reaction was not in fact particularly unusual, but I found it baffling. The arrival of space aliens would be perhaps the most important thing that has ever happened to humanity. The entire future of the species would hang in the balance, and everything would hinge on what the aliens want. I know my grandmother very well but I still don’t really understand how she thinks about things like this. The best I can come up with is that she believes in many fantastical things and therefore just one more fantastical thing changes little for her.
This isn’t a direct response to what you’re describing but I think it’s relevant as an illustration of one way how the fantastical can be less important than the mundane for people.