Perhaps you remember George W. Bush's innocent use of the word "crusade" six months ago, and perhaps you recall the furor it provoked. Commentators around the globe quickly pounced: Why, the word is a provocation, they insisted. It will rattle Muslim moderates and confirm the worst fears of the radicals who hate us so. There are two things to keep in mind, however, about Bush's use of "crusade": He meant it in the familiar secular sense, not as a synonym for holy war. And he never used it again. Now comes Yasser Arafat, one week ago today, exhorting Palestinians to...