There is a quite fantastic article by Jared Diamond in the current New Yorker about revenge, which concludes with the touching story of how his father-in-law’s life was poisoned because he never shot a fascist whom he had at his mercy in Poland when the war was ending. I can’t link, because it’s not online, and I can’t scan anything in, because I am on a train. I will try to enlarge this later. In the meantime, get out and buy it.
UPDATE: still not on the New Yorker site, but linked off Brockman’s.