One of the most repulsively fascinating facts about contemporary black popular culture is how it continues to reach fresh lows. It finds new ways of leaping all fences that would bar it from falling into a bottomless pit of tastelessness. All of the insults and burdens of minstrelsy have been bested by black comedians and rappers who have made stupidity, hedonism, pimping, misogyny, pornography and violence their stock in trade. One defense of this amoral sense of life and culture is that black people didn't invent any of it, so why shouldn't they, like the white people, be able to...