Journalists are unpopular, as a profession, but war correspondents get a rare pass. In films, books and the wider culture there is a dark glamour, a reckless heroism that attaches to people (mostly men) who head with laptop and camera towards battles that other civilians are fleeing. Fergal Keane, one of the most celebrated faces of BBC news, embodied that myth. His new book The Madness, part memoir, part meditation, picks it apart. He explores with brutal honesty why he and many colleagues travel to conflict zones in the first place (it is different, of course, for journalists who have...