Spoken like the sort of arm-chair quarterback that you, and the rest of your "opinion makers," would like to surround yourself with in the relative safety of "places" like facebook---With a nice diatribe about straw-man "liberals" thrown in for good measure.

In fact, you sound like an ivory-tower liberal, looking down your nose from a great distance at one of the many symptoms of social and political imbalance in our system---And like anyone willing to jump to conclusions, all too willing to call the symptom the disease.  

The disease, in my opinion, can best be described as the devolution of a free society into a police state; among the symptoms being the blatant disregard among militarized police forces, under current rules of engagement, for civilian lives, regardless of "color."

You said it best, however: "I don't know enough about these cases, and neither do you, to make an informed judgment."  Maybe follow your own advice next time.