People believe what they want to believe, much of the time. I don't mean to say that they believe things without any reason, but they believe, oftentimes, without good reason.
Most people will give some reason why they believe something. But an indicator of the fairness of their point of view is how they respond to even-handed, fair criticism of their view and to evidence for an opposing view. Lots of people have reasons for what they believe, but when those reasons are refuted--when they're taken away or weakened by other evidence--do they still stand on their point of view, or are they willing to adjust their view based on the evidence that comes in?
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