Wow Markham - you have written this with palpable zest! Electric, succinct, direct writing. Thanks so much, a pleasure to read. Bookmarking this for future referral! Thanks for the primer on intuition!
My take on why we think like we do is based on the takeaways from Jonathan Haidt's excellent book - The Righteous Mind. It goes someway in explaining why we are so tribalistic. We are essentially intuition-driven information processors, constantly scanning the world around us, morally interpreting information and colouring narratives with our unique worldview. We readily allow intuition to lead us and then use our rationality to come up with evidence to support our beliefs - the absolute arse-backward way it should be.
I'd really appreciate if you could read my article and feedback - the parallels between your take for WHY we are so polarized and partisan and HOW our brains are literally wired to be this way according to Haidt, are uncanny.
I've also written an article titled "You Don't Know What You Don't Know" based on learnings from Matthew Syed's "Rebel Ideas" which focuses on the question of WHY diversity is important in breaking free of our intuition-bias. I write about bursting info bubbles. How do you know if you are in an information bubble or an echo chamber? If you are thirsty for information but not getting any, you are in an information bubble. If criticism of your perspective further reinforces your belief in that perspective, you are in an echo chamber. Exposure to the outside world bursts this bubble and diversity brings this exposure.
I think it's the perfect companion piece for your wonderful writing - do let me know what you think as I'd appreciate your feedback!