Most of us just want to fit in, and believe what everybody believes.
Coming to your beliefs this way is not actually intelligent. We don’t do it consciously. It’s just tribalism or herding instinct or whatever.
So if everybody agrees with you then that’s a pretty good sign that you are wrong.
Such careful thinking, such scientificness, is rare as hen’s teeth.
It’s the only way to be sure you are correct or not.