A few thousand years ago, over the course of many years, people who didn't know each other all wrote down books with various stories in them--embellished, fueled by hallucinations, bragging, exaggerations, deliberate fiction, attempts to explain Stone Age people couldn't yet explain--all with a tiny sprinkling of true facts mixed in.
Ever since then, the same myths keep getting repeated and repeated, and few people actually question them, even though those myths are easily disproven.
It seems as though it's mainly those who are caused pain by those myths who end up fact checking.