What bothers the inner city Af-Ams is their perceived lack of power to obtain whatever it is they desire. They desire a conviction regardless of the facts and the application of law. Their anger comes from this emotional well of self-deluded disenfranchisement, allowing themselves to be whipped into a frenzy by the grievance mongers; be they racists, Marxists, Communists or Union activists. They must be allowed to express their anger and hatred through looting and destruction, rather than take a moment to actually consider the facts.
Feel free to include the Obama Administration and his "Justice Department" as equally complicit with those on the ground fanning the flames of sedition.