The conflict between modern democracies and Islamic terrorists reminds Lee Harris of a blood feud. The idea of a blood feud in turn reminds me of "Fools Crow", a novel about the travails of the Pikunis, a small band of the native American Blackfeet tribe, in 1870. -- snip -- As Lee Harris might put it, the horse-stealing and scalping are theatrical gestures. They are attempts to humiliate the other band, not to defeat them. Going on a raid is a rite of passage for young members of the tribe. In fact, the title character in Fools Crow earns his...