I will concede that there is always the possibility of a "magic bullet" killing you if it hits you in the sweet spot. But drones don't have to be exclusive to dishing out justice during riots. Just imagine if the Ferguson police had roof mounted Pepper drones mounted on each cruiser. They could have easily launched the drone, incapacitated the perp with Pepper, Taser or Net technology, and averted a crisis.
Iirc, assaulting a police dog counts as assaulting an office but you would probably only be on the hook financially if you down a drone.