If I believe that my particular perspective or solution for any given political, religious or social issue is the only right view, it creates a problem. It means that everyone else in the world who thinks differently is wrong. That seems both arrogant and dangerous.
Katheryn Schulz has an insightful TED talk on the subject.
Think for a moment about what it means to feel right. It means that you think that your beliefs just perfectly reflect reality. And when you feel that way, you’ve got a problem to solve, which is, how are you going to explain all of those people who disagree with you? It turns out, most of us explain those people the same way, by resorting to a series of unfortunate assumptions. The first thing we usually do when someone disagrees with us is we just assume they’re ignorant.
If we would all ask ourselves, “Is there some possibility that I’m wrong?” before we respond to others, the world would be a better place.