That's the EXACT reason why blacks are leaving the Chicago area. And they may be aware of the financial situation of Cook County itself, a situation that could cause the entire state of Illinois to go into receivership (the British English term for bankruptcy) and all the mess that could create.
The areas in LA which were the sites of the riots: Watts, South Central, are no longer black-centric since Mexicans and Latinos have moved in to displace them. The areas are experiencing new revivals recently.