If you're genuinely curious why there is more uproar when it is a minority killer, I would suggest it is reaction to the MSM and BLM nonstop agenda to portray a one-way street where white cops hunt unarmed black men for sport because they are raging racists.
Theres your answer, right there JStraw.
Black Lives Matter (BLM) rhetoric did, and does, include calling for the murder of Police.
I grasp there is no formal membership, to BLM and that anyone can toss on a BLM shirt, make a sign etc.
End Result, regardless, is you have the projection of members of a certain Racial Group openly
calling for the Death of Police.
Which then takes place.
Its the addition of a Declaration of War, that Call to Arms against Law Enforcement and thus against all who support Police that caused, and causes, focus here to be as it is.
Plus as Harry points out: The Media did not make Big News out of these killings, bcuz their potential to stir Racial Tensions and Create Conflict between people was not as great as reporting on the protests and telling liberals that a reincarnated Adolph had gained The White House, assumed Power in USA so....nothing was really heard of these killings.
If they'd been associated with a Group that had Declared War on USA then the response would have been similar to what you saw, and see, when the monster was black.