Turns out most everyone thinks based on reasoning developed by years of cumulative, biased experiences that ultimately amount to fundamentally distinct axioms of how the world works. Few people actually have opinions based on "logic", least of all the people who fly the banner of "rational" or "emotion free" opinions. Answering why just provides post-hoc explanations rather than an actual cause (which humans are great at coming up with, just look at split brain cases). Which just turns most "big topic" disagreements into competitions over who can come up with a better sounding justification.