the reason is simple--racial self-hatred. Clarence Thomas is a good example, he despises his race and has done everything he can to become a white man. Married to a white woman, educated (through affirmative action) at Yale, protégée-ing a white patron (John Danforth), spitting on the disenfranchised, particularly criminal defendants, the vast majority of whom are black, the list is endless. Its like a reformed drunk turning his back on his wino buddies in the gutter when they need him most. Uncle Tom is alive and well and wears a black (ironic) robe.