If they were trying to appease the blm crowd with an arrest, and he winds up being found not guilty, it is probably going to be even worse
The big hope is that the blm movement pretty much dies out by then and the DA hopes he's gotten his appointment to a federal judgeship from Hillary before then. I agree he was not thinking big picture, just keeping it calm for the moment and be seen as a hero for keeping the city from burning (for the time being).