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.
I’m a Yakuza game series fan, so, a guy who I know asked me what do I think about the live action series of Amazon Prime. I said that isn’t going to get the same reception as other live action series, so this mf agreed with me with no hesitation. I got mad, no because he was trying to “giving me the reason” but he was trying to lick my boots.