It’s tough to find out that everything you’ve believed for your entire life is wrong.
People will fight more violently to preserve self-image than life itself. "Death before dishonor" Which is why it is exceeding to hard to admit that you were wrong. Once you admit and accept your own fallibility, life becomes much better, unless you become an immoral sociopath, like Bill Clinton. You need to balance humility with self-respect and your own moral compass.