We spend a lot of energy fighting to keep our beliefs. Fighting to go on doing what we have always done. It might be the remnant of deep learning; those first lessons are designed to keep us alive. So, no matter where we go or where we live our childhood haunts still have a special ambiance. Those early foods remain our favourites.
First ideas have the same quality. They are friends no matter how absurd they become or how dangerous to others. We see this most clearly in chauvinism, but it exists in how countries see themselves, how tribal customs work and how religions entrench themselves in communities.
Anyone who has not changed their minds is liable to have never had an original thought.