I think that some people just hate to admit that they are wrong.
My Dad's Dad was a local dim precinct chairman or some such thing. Southern Democrat. You know the type.
My Dad was aghast that I was voting straight party Republican... "Your Grandfather would roll over in his grave..."
I told him to take a good hard look at the Dimocratic platform... "My Grandfather would roll over in his grave if he knew what was going on in his party."
It wasn't an instant sell, but my Dad's a very loyal Republican now. Mom always has been, and she always refused to go to the polls with him because she knew he'd cancel out her vote. So he had to remember to go on his own, and motivate himself, which he didn't always do...
Now she drives him there.
People don't like to admit an error, and the bigger the error the more loathe they are to admit it. Buy a lemmon automobile, and you will defend it, to yourself and others, as long as you can--but if you do have to drop that defensiveness you then will be all the more disgusted with the car.Cognitive dissonance, I believe it's called.