This!!! I've struggled with impostor syndrome A LOT but coming here and seeing a lot of supposedly well paid, successful, highly educated people say the things they sometimes do... I don't mean to say I'm smarter, I'm just saying, it's comforting.
Sounds bad, but just change "dumb" for "naive" or "biased" and we agree.
To be more specific, it helps me identify the ways people gets behind some weird idea and maybe why. Same goes for the negativity that someone mentions in another comment, it's the same to me: unexpected reactions that say more about who reacts than about the criticized idea.