To rephrase your point somewhat, when a police officer (of any color) kills an innocent person (of any color), the entire community stands together in condemning the act, even if the police choose to defend the actions of the officer as "within policy". However, most of the thinking people in the community wait to find out if what the officer did was actually reasonable within the sequence of events that actually occurred.
In cases like Michael Brown, it is not the sequence of actual events that matter to the community agitators (and white guilt profit takers), but it is the imagined racist movie villain chain of events that are posited to have possibly occurred that are supposed to overshadow reality.
I, like most conservatives, condemn the police when they have transgressed in the real world. The racists who profit from Ferguson type events condemn whenever the officer and victim correspond to their stereotypical ideals in terms of skin color, no matter what actually happened in the real world.
the gentle giant was not innocent...... he was a dangerous criminal