Post hoc ergo propter hoc? Murder rates have declined comparable amounts in lots of cities that aren't systematically targeting minority residents for harassment.
> What do you want the police to do, patrol around Lincoln Park and Lakeview where all the wealthy white people are?
No, but city and state gov't should be responsive to the causes of these issues and be proactive about solving them. Usually that will mean looking at class and race disparity and implementing policy that will provide better opportunities for those people, as well as defeating existing roadblocks that prevent those people from taking control of their lives.
Those neighborhoods are where crime happens. A map of violent crime in Chicago (a city that's 65% black or hispanic): http://upload.wikimedia.org/wikipedia/commons/2/29/Chicago_v....
A map of Chicago by race: http://www.radicalcartography.net/index.html?chicagodots
What do you want the police to do, patrol around Lincoln Park and Lakeview where all the wealthy white people are?