I'm just going to say that these instances where people who have seen a certain class of individual routinely/systematically beat, cage and/or murder others with whom they identify(because of physical similarities i.e. "race", family ties, geographic proximity or whatever else, right or wrong) decided to act out violently against *specifically* that aggressor class are completely expected and predictable. I can imagine life as a second-class citizen might inspire vindictive thoughts toward the most visible and accessible symbols of one's oppression.
You don't have to agree with the act, but if you ignore the background you're lying to yourself.
This is not going to end well. Cops are going to act more aggressive out of fear(oh noes, a whole dozen killed in a year? Is it approaching the odds experienced by the soldiers these guys pretend to be, in the war where they fired the first shots?), which will engender more hatred(rightly) among those they act against, and politicians and frightened mundanes will throw more blind legal, moral and economic support to the police(wrongly).
This is not surprising. It's the war the cops have always wanted.