Try teaching non-elite undergrads sometime, and particularly assignments that require some sense of epistemology, and you'll discover that the vast majority of people have pretty poor personal epistemic hygiene—it's not much required in most people, most of the time, in most jobs.
We evolved to form tribes, not to be "right." Jonathan's Haidt's The Righteous Mind deals with this topic well. https://jakeseliger.com/2012/03/25/jonathan-haidts-the-right...