If you look at the Left's Coverage of the events, you will see things that the Left wants to show you, if you look at the Right's Coverage you will see things the Right wants to show you. All media is showing you a narrative to make you more incentive towards their point of view.
Try looking at both points to get the whole picture.
OT: The man who committed this crime was a lunatic. He would have committed this crime regardless of what had happened prior, this was just a convenient excuse to justify it to himself, to let his mind feel free of guild and consequence. Same with the looting of shops in Ferguson. Those who looted were not there to protest the outcome of the trial, they just used it as an excuse.
Further, if this madman had actually gone after the cops involved in the death of the Garner, I could at least try to understand what he was going for (It still wouldn't be justified), but I could see what his plan was. What he did however was just mindless slaughter of two innocent men.
As for the cops, I am still hard pressed on what to believe when it comes to what happened in Ferguson and New York, since I cannot find un-bias news related to the events.