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See also Jacques Derrida, charlatan. Quotable:

If he had become a football player as he had apparently hoped, or taken up honest work of some other kind, then we might simply remember him as a "good man." But he devoted his professional life to obfuscation and increasing the amount of ignorance in the world: by "teaching" legions of earnest individuals how to read badly and think carelessly. He may have been a morally decent man, but he led a bad life, and his legacy is one of shame for the humanities.