I finally learned this and, after long denial about it, now "know" this as a fact about the universe. Or at least humans. That humans operate 1000% out of beliefs and that they didn't come to those beliefs rationally. And that you can't reason someone out of a position that they didn't reason themselves into.

It's actually been hard for me to come to grips with this emotionally and to integrate it into my day-to-day operational instincts/intuition.