“A man with a conviction is a hard man to change. Tell him you disagree and he turns away. Show him facts or figures and he questions your sources. Appeal to logic and he fails to see your point.” [Leon Festinger, et al., When Prophecy Fails (1956)]
Have you ever wondered why other people are so unreasonable and hard to convince? Why is it that they disregard hard facts that prove you’re right and they’re wrong? The fact is, we humans aren’t wired to think very rationally. That’s been confirmed recently by brain scans.
Psychological experiments have shown that humans tend to seek out even weak evidence to support their existing beliefs, and to ignore evidence that undercuts those beliefs. In the process, we apply stringent tests to evidence we don’t want to hear, while letting slide uncritically into our minds any information that suits our needs.
— The Wisdom of Crowds by Brooks Jackson and Kathleen Hall Jamieson