I think it's been hard for people to understand how Islam can be a good religion and yet the Islamists are evil. Those of us who have had experience with Islam understand this just as we understand the difference between snake handlers and people going to church on Sunday morning.
From their experience or from the recorded experience of others (history) men learn only what their passions and their metaphysical prejudices allow them to learn.
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Going out and playing football or baseball with the boys when I was a tomboy was a great way to learn about winning and losing and most girls didn't have that experience.