We all have political beliefs, and sometimes just can’t understand another's insistence on a different position. We might not comprehend why someone likes Beyonce when we prefer Bach. Some people are religious, others not, and never the twain shall meet. We hold and debate beliefs over just about everything.
If we were totally rational, we would educate and correct each other instead of incessantly arguing. But then again, perhaps our differing beliefs and arguing about them is exactly the way in which we translate personal experience for the good of the tribe. Perhaps all these differences and tribal affiliations serve for our survival.
Has any research been done on this?
(Noting that philosophical debate is not very useful, since we need some objective means to stand outside of our own beliefs to work out what is going on.)