Hysteria

Humans typically base their heuristic hypotheses (aka hysteria) upon observed correlations.

However they are far worse at observing and absorbing a lack of correlation. The beginner’s mistake, worn to the grave.

By way of example, astrology is given some credence because of the odd bit of coincidence that reinforces the dogma. However the far-more-usual complete absence of coincidental reinforcing observations will be completely ignored.

Repeat after me; we don’t know what we don’t know, including just that.