Mencken on the Dunning-Kruger effect

The agents of such quackeries gain their converts by the simple process of reducing the inordinately complex to the absurdly simple.  Unless a man is already equipped with a considerable knowledge of chemistry, bacteriology and physiology, no one can ever hope to make him understand what is meant by the term anaphylaxis, but any man, if only he be idiot enough, can grasp the whole theory of chiropractic in twenty minutes.

- H.L. Mencken