Belief is not generally fact based. Going strictly with the facts is an incredibly disciplined thing. Feynman used to play games to keep himself sharp, to avo

Belief is not generally fact based. Going strictly with the facts is an incredibly disciplined thing. Feynman used to play games to keep himself sharp, to avoid fooling himself because as he said, the easiest person to fool is yourself. With people in general the belief comes first and then you backfill with supporting evidence and argument. Also we tend to pull our beliefs into our identity. Then a challenge to our beliefs is a challenge to our identity, and very hard to swallow. So it is also difficult but important to keep yourself from identifying yourself by your beliefs.