Humans are hardwired to dismiss facts that don’t fit their worldview
Twice I have been through interviews that use hours of psychology assessments to filter candidates.  One of those was a large hedge fund.  Through that I have learned that objectivity is a measurable and identifable personality trait that is astonishingly rare.<p>Most humans are hardwired to seek mutual security, which means banding together as a stress coping mechanism.  That incidentally means some natural revulsion of originality, objectivity, individuality, and even honesty.  More important are group conformance, mutual reassurance, and perceptions of social security.<p>This is readily observable when you take a group of people who have never worked together and are generally unfamiliar with the outdoors and drop them into an outdoor military training exercise, such as college ROTC junior classmen.  Naturally they congregate really closely together and wait for somebody to tell them what to do with minimal or no initiative, all of which is a bad idea in modern military training.