Holding onto an opinion when proved wrong is a sign of not wanting to lose face. A psychology experiment showed that we hold onto material things as soon as we take ownership. A group of people were asked to choose either a coffee mug or a bar of chocolate. Most saw the mug as the better choice, but when participants were first given a chocolate bar they were generally unwilling to trade it for a coffee mug, and participants first given the coffee mug were generally unwilling to trade it for the chocolate bar. Although the mug was seen as the better option, once given a bar of chocolate, participants were reluctant to give it up. Maybe it's the same with opinions. Once formed, they are difficult to let go.