Dear interjection,
I have read your post over multiple times. A comprehensive response eludes me. There are multiple issues here, and very few people seem to be polarized across all the topics. Different people put the emphasis on different aspects of the same issues. This could lead to more chaos them calm. Let me answer one part at a time.
You asked me about what are the goals of the rioters. I think we understand that rioting is not open dialogue. It is hard to say that if their demands are met, then the riots would cease.
Though some of the goals in these riots are self evident. In Minneapolis, there was a real sense that the DA would not press charges unless he was compelled to. The shots really seemed to be about holding police accountable.
My take has been that the majority of violence across the nation, was due to the shutdown of society. The lower classes are not going to sit in front of a television to watch an endless news cycle about the global health crisis. The fact that so many Americans had nowhere to go, and cities were empty of street traffic, opened up the possibility of a takeover of public property. I think most Americans joined in as something to do. Similar to the crowds that went to see the navy hospital boat enter New York Harbor.
Once we are dealing with a national boredom event, all dialogue and goals are largely irrelevant. Professional looters plied their craft. Anti American actors vented their feelings. Anarchists enjoyed the free ride. Overall, the context does not help political activism because they have to take ownership of all the side shows.
When the mainstream media started hyping the Aubrey case, it alarmed me because it seemed pointless. The murder happened in February. The outrage over the video was enough to bring about several arrests, and a state investigation. There was on need to hype the story, as there was no other headlines available. It just set up a super sensitive background for whatever would happen next. And then George Floyd happened.