You can hardly turn around these days without encountering some public scold decrying the influence of violent movies, video games, and television shows on the behavior of the public at large. At the same time, you rarely hear anyone threatening to slap warning labels on books, lest any susceptible souls take them seriously. But literature has long influenced some of the world’s most notorious crackpots, (the Aum Shinrikyo cult took some of its ideas from an Isaac Asimov novel,) and such notorious terrorists as Timothy McVeigh are known to have worshipped at the altar of a terrifying book of hate called The Turner Diaries, not at the game console of Grand Theft Auto.