>I suggest groupthink is a critically important aspect of most human behavior. And yet somehow, we rarely manage to discuss this, and are repeatedly surprised by it. I'm unclear on why.

Isn't that just a manifestation of the 'Blind spot' from Johari Window?

In general it is really hard to think about the things you already internalized.

Perhaps not when it's a failure to consider groupthink in others?

I don't often see something very vaguely like "Financial folks are anticipating X, but as a community they don't have a great track record of anticipating, err, the internal politics of <country>. So for that part we'll turn to ... , though that community's grasp off financial context has often been weak." etc. Systemic variations in the capabilities of communities, being systematically acknowledged and addressed, in the context of public analysis and discourse.