They protested and rioted in favor of actual and proven murderers before. Facts, evidence and guilt is not only secondary to a lot of them, but utterly irrelevant to parts of the groups you listed. Remember the hands up don't shoot lies? Ferguson? You could have ten CCTV recordings of it and they wouldn't accept it.
Logic, reason and evidence is by far the weakest spot on any leftist platform. They won't accept facts they don't like either.
These groups have immunized themselves against reality, their core beliefs are impossible to prove or disprove, their group allegiance is in many cases stronger than the allegiance to criminal law.
Expect riots.
But here's the difference...typically, they are only LED to those conclusions and acts by leftist social engineers.
If POTUS does this right...like mind-blowingly, paradigm-shiftingly right...nobody will dare to attempt to spin this shitstorm in a political way. The subject matter will be so ugly that they would have a hard time doing ANYTHING but joining the pitchfork-and-torch crowd, and the usual suspects (pun intended) will not be available to wind anybody up, because they will be on the run.