Paige Stalker might be alive today had she learned about Routine Activity Theory. But she is dead and two of her friends are critically wounded, the latest poster children for R.A.T.: White people in black neighborhoods should expect to be the victims of racial violence. Paige was one of five teenagers from an upscale neighborhood in nearby Grosse Point who were on their way to the movies three days before Christmas when they decided to pull over and smoke marijuana in Detroit. While they were getting a high, a black man with a high-powered rifle approached their car and fired...