They don't want to anhilate the black race any more or less than the human race. They need blacks to serve as a vector for the destruction of western civilization. Everything they bring to their culture has become is designed to drive a wedge between us. Ripping social cohesion apart. It's sad that they have allowed themselves to be so completely subverted. Like the race of orcs in LoTR, bent to the will of their Dark Master Lord Sauron.