Harold Rood, a professor of international relations at Claremont McKenna College who died in 2011, was not as well known as he was influential. A soldier in Patton’s army in World War II, he taught his students that war is permanent to the human condition, and that in war it is better to win, for no one ever had to accommodate a loser. America will always have enemies, he told them, and those enemies will forever be planning and expending resources to place themselves in a position to defeat us. It would be nice if it was otherwise, he was fond of saying, but it is not otherwise. It is the way the world works.