Considering that Jim Butcher used 'tarbaby' to describe a black servant creature in his last book, I don't expect that much better from him anyway.

More to the point of this particular wank, he also notes in that passage about Hyde Park that the (all white, if I recall correctly) Alphas have been patrolling and cleaning up the crime there. So apparently what this black neighborhood needed was some white people to save it from itself.