The nypd is using criminal profiling, those who commit crimes just happen to be African American.
http://abcnews.go.com/m/story?id=19084229
To me this logic is inherently the same "liberal" justification you despise in many other aspects of policy, be it sodas, lunch menus, gasoline prices or environmental regulations. It seems the only difference upon whether you take issue is if you personally affected, then it's a liberal conspiracy; otherwise, it's just whining libs.