Well any time you get something like this happening then you'll have people making claims of institutional racism and saying it's not about this one case, etc. I'm not sure what they expect to happen on foot of this.
The fact is that for the individuals involved, it is very much about this case. Particularly in the context of justice and law enforcement, I don't think it's fair or right to ascribe motives to the officer in question based on perceived flaws in the justice system at large, and the actions of other individuals over whom he has no control. In the same way that it wouldn't be fair or right to paint the victim as a dangerous criminal given that most dangerous crimes are committed by his demographic. Every case needs to be assessed on its own merits alone, otherwise you're just scapegoating, which is simply another form of injustice masquerading as justice.
I'm not sure why it didn't go to trial. Presumably the DA or whoever deals with these matters decided that the case would be unlikely to result in a conviction, and discharged his responsibility not to waste public money and clog up the courts with what would essentially be a show trial.