Because I live in the area, I know who lives here, and I know the recent history of Black Community/MPD relations going back to the 90's. Hell, my girlfriend lives a block off of 38th and Chicago, so I've had a front row seat.
The idea that this was some sort of plan is pretty farfetched. What I see is a confluence of groups coming together in the aftermath of George Floyd's death, and a lot of them don't really run in the same circles. Anarchists, Gangsters, and Black Panthers might have some overlapping ideological similarities but they don't hang out or plan things together.
Also a lot of the groups don't have an overarching structure in the way that the police or the NRA or whatever does. Anarchists/Antifa are both more ideologies than they are organized groups and say that this or that person is the leader of either is pretty nonsensical; they tend to coalesce and break up in response to events. Gangsters are broken up by blocks and streets and membership gets pretty amorphous. The vast majority of the rest of the rioters were angry kids who wanted to punch cops.
I just don't find the idea that anyone bringing this all of these very different groups together as part of a larger plan is feasible. It's too complex and it would leave traces that are pretty obvious.