People don't really like to engage in the kind of mechanistic analysis required for a causal explanation. Unless you are a plumber or you make zippers or ball point pens, you probably can't explain these very well. This gap between what you know and what you think you know is called the illusion of explanatory depth.
There are a lot of barriers to changing your mind: ego, overconfidence, inertia — and cost. Politicians who flip-flop get mocked; family and friends who cross tribal borders are shunned. But shouldn’t we be encouraging people to change their minds? And how can we get better at it ourselves?