they don't care about blacks or whatever, they're just legitimately hate themselves and get off to human suffering, and since blacks commit disproportionate amounts of senseless violence they see them as a means to an end for the depraved fantasies they have concocted in their heads (rape, genocide, child abuse, pedophilia etc.)
Bleached fetishists usually just wanna fuck non-white women, the worst you'll get with them is slaveplay stuff or using racial slurs. for black fetishists this whole thing is basically a racist version of bestiality porn