Consider three criminal cases. No. 1: Christopher Newsom and his girlfriend, Channon Christian, both students at the University of Tennessee in Knoxville, were carjacked while on a dinner date in January, repeatedly raped (both of them), tortured, and killed. His burned body was found near a railroad track. Hers was stuffed into a trash can. Five suspects have been charged. The crimes were interracial. No. 2: Three white Duke lacrosse players were accused in March 2006 of beating, kicking, choking, and gang-raping an African-American stripper, while pelting her with racial epithets, during a team party. No. 3: Sam Hays bumped...