The overwhelming fear that one might have been mistaken is the by far the biggest hurdle for humanity in general. It is absurdly difficult for many people to admit that they made a mistake, that they didn't fully understand something, that they were tricked, etc. It really shouldn't be that hard. It's a perfectly normal part of the human experience. It doesn't mean that someone is stupid or otherwise inferior. What actually IS stupid and inferior is going your whole life without ever mentally evolving because the process is a threat to your ego.