@MLClark The issue has been delved into in lengthy academic articles on the psychology involved. But the most concise description I have ever heard was by ICU doctor on IG.
The bridge too far is when ideology moves into identity. So they are no longer evaluating information. He said, "It is like arguing with someone about their own favorite color."
It is baffling to people like me who dramatically changed positions over time with new information.
@MLClark Related, it reminds me of a pet peeve on that stupid Churchill quote we hear so much.
Churchill was far from an all-knowing wise philosopher though he was the right guy for a specific time in history.
I changed from conservative (default settings from my upbringing and environment) over time precisely because I have brains. I am data driven and far from a wide-eyed idealist only using my heart.
Churchill was wrong, about this and other things. https://www.bbc.com/news/magazine-29701767