[snthd]

> Frequently, when I try to bring this up, the cause is waved away with "oh they're just stupid/ignorant/angry" or some other such explanation. The current-year favourite is "they just believe fake news", and I'm sure next year there will be a political explanation, and then the year after that we'll loop back to generic ones. (The irony of denouncing other people as causing polarization "because they're just angry and stupid" is lost on most people)

I think what you're describing is attribution bias - https://en.wikipedia.org/wiki/Attribution_bias