On the sustainability of ideological clichés

Why are people generally, against logic, obvious facts and evidence, so committed to their current ideology? I think it’s for about the same reasons that horses in harness have blinders on. I think if we change our worldviews, ideologies, preferences to suit every new fact that comes along, we will find ourselves only able to satisfy our most basic physiological needs. Eat, sleep, surf Facebook, change orientation, repeat.

What do you think? Where does this stubbornness come from?