Explanations exist; they have existed for all time; there is always a well-known solution to every human problem — neat, plausible, and wrong.

Mencken - neat plausible and wrong - wist_info quote

H. L. Mencken (1880-1956) American writer and journalist [Henry Lewis Mencken]
“The Divine Afflatus,” New York Evening Mail (16 Nov 1917)
    (Source)

Reprinted in Prejudices: Second Series (1920) and A Mencken Chrestomathy, ch. 25 (1949).

Variants:
  • "There is always an easy solution to every human problem -- neat, plausible, and wrong."
  • "For every complex problem, there is a solution that is simple, neat, and wrong."