Mark Twain was a kind man, and his moral outrage against moralism -- to which American lynchers and imperialists were committed -- made him write many stories and essays that tell us, again and again, that man "is such an unreasoning creature that he is not able to perceive that the Moral Sense degrades him to the bottom layer of animated beings and is a shameful possession....It is the Moral Sense which teaches the factory proprietors the difference between right and wrong -- you perceive the result. They think themselves better than dogs" (Twain, "The Mysterious Stranger"). I think that Twain was much more perceptive about morality than, say, Kant.
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CB: Hey, maybe this is why the eating of the fruit of the tree of knowledge of good and evil was forbidden by God in the Garden of Eden. ( metaphorically speaking). The invention of morality is , uh, immoral.
CB