Also, I question whether bounded rationality fully explains bias and unreasonableness. Certainly it’s behind some of it, but what about when people expend huge amounts of energy and anger to cling to untenable positions? I daresay that denial and intellectual narcissism have a far greater role.

Bounded rationality is, at least, rational. Within bounds. It’s a cut-rate, corner cutting rationality, which is the very opposite of an overinvested and deliberate anti-rationality.