It's easier to fool people than to convince them that they have been fooled

Mark Twain perhaps

It starts from an extremely young age when they're taught that questioning what their parents and pastor say is an unforgivable moral failure.

It's human nature that some people don't feel, or don't feel as acutely. There's also a cultish aspect to it, where because everything is MAGA Vs democrats, all your friends and identity are likely bound up in the same thing, so admitting you were wrong isn't just admitting you were wrong: it's completely changing the way you see yourself and severing many relationships.