"Given the inefficiencies of what DC laughingly calls the 'criminal justice system,' I think we can safely assume that 95 percent of the black males in that city are semi-criminal or entirely criminal...[W]e are constantly told that it is evil to be afraid of black men, [but] it is hardly irrational. Black men commit murders, rapes, robberies, muggings, and burglaries all out of proportion to their numbers."