Ah, just to answer this: Because humans are rationalizing creatures, not rational. Ultimately we believe in something then justify. Because of this top-down approach, we get all sorts of inconsistencies in our beliefs. I'd go as far as to say that we are all guilty of this. It's really hard for us to adjust our opinions "rationally" after the fact.Note: to reiterate, the question was "how" not "why"; although understanding why is helpful.
No false equivalence implied, but given that we are on a board talking about MBTI and Enn, we are not significantly different. Nor is being a skeptical champion any better in this context.