The best punditry is informed by a sense of history and by in-the-field reporting. Two new books from the top writers in the conservative movement wonderfully illustrate that point. P.J. O'Rourke has made a long career of going to the world's trouble sites and explaining, from a conservative/libertarian point of view, why people are behaving so badly. Although self-billed as an "investigative humorist," O'Rourke's dispatches convey far more understanding and insight than more serious-toned pontificating. In "Peace Kills," O'Rourke reports from such exotic spots as Kosovo, Israel, Egypt, a demonstration by leftists in Washington, D.C., Kuwait, Iraq and, for sobering...