Law enforcement everywhere is about moving crime out to the margins. It will never stamp out all crime, but it does tend to reduce the quantity of it.
And I'm not even convinced that "moving it elsewhere" is necessarily a bad thing. I'd rather have most crime concentrated in a small area than distributing it over a large area. Regardless, people should be allowed to feel safe in their communities, and that just isn't the case for embarrassingly large amounts of SF.