Why Facts Don’t Change Our Minds

This is a great article for engineering managers:

https://jamesclear.com/why-facts-dont-change-minds

The economist J.K. Galbraith once wrote, “Faced with a choice between changing one’s mind and proving there is no need to do so, almost everyone gets busy with the proof.”

Leo Tolstoy was even bolder: “The most difficult subjects can be explained to the most slow-witted man if he has not formed any idea of them already; but the simplest thing cannot be made clear to the most intelligent man if he is firmly persuaded that he knows already, without a shadow of doubt, what is laid before him.”

What's going on here? Why don't facts change our minds? And why would someone continue to believe a false or inaccurate idea anyway? How do such behaviors serve us?