This decision is infinitely more surprising to me than the Ferguson one for a few reasons.
1. It suggests body cameras will not help tremendously.
2. There was little-to-no he-said, she-said, since there was a video, unlike Ferguson where some of the eyewitness testimony was sketchy on both sides.
I think Body cameras are still needed....
But you are right, that this does show that prosecutors and the system protecting its own ass (the unions/department and the courts)...shows that even having footage of something, doesn't mean it will get justice, if their ultimate goal is to cover up their organization, and protect it from getting sued or members getting jailed.
However, I think if you start having more footage, then it becomes easier for people to really see the issues first hand instead of waving it away as a criminal getting killed by cops for doing criminal activities (which seems to be a mind set some people take on this when they hear abut the news).
That said, I think what this really shows, is that society on the whole has to do something about this. That it can't just be black people and activist speaking out about this. It has to be something everyone needs to push for.
And if not, then people shouldn't be surprised when riots and violence are the next step being used. Those that refuse to do anything about it, have no one but to blame but themselves for things resorting to violence. Really what other option is there, when the system is failing people (when they try to reform it by voting and it doesn't work). When all other outlets have been exhausted.