—Max Zolotukhin—Getty Images Two radical ideas have been introduced into human thought, wrote the novelist and humorist Kurt Vonnegut. One was that “energy and matter are pretty much the same sort of stuff.” That was Einstein. The other was that “revenge is a bad idea.” That was Jesus. We are so wired for vengeance, so trained to retaliate, mused Vonnegut, Jesus must be classed among the revolutionaries.

Vonnegut was no Christian, preferring to describe himself as a “Christ-worshipping agnostic,” but he dreamed of a world in which the long “chain of death and destruction” is broken. That is why he opposed the death penalty and one of the…

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