THE NEXT time a group of black folks invites somebody with the last name of Cosby to speak anywhere, you can be sure it'll be Camille Cosby, not her husband, Bill. A few years back, after the Cosbys' only son, Ennis, was killed by a Russian immigrant who had racist attitudes toward black people, Camille Cosby published an op-ed piece blaming whites. It was white America, Camille Cosby wrote, who taught her son's killer to hate blacks. She even drew a connection to President Ulysses S. Grant's picture on the $50 bill and his ownership of two slaves - who...