So, the next time someone quotes philosopher George Santayana for the umpteenth time that "Those who cannot learn from history are doomed to repeat it," just assume that what follows will probably be wrong. Having a Rolodex of cocktail party quotes to beef-up an argument is not the same as the hard work of learning about the past. Thus, we are now warned that the war against terror is failing because it has lasted as long as World War II — as if the length of war, not the cost, determines success. Yet the nearly 2,000 U.S. combat fatalities in...