Drones are 100% anonymous and 100% unaccountable. They can abuse rights with impunity. If a cop irresponsibly shoots someone, he can be sued, fired, charged and imprisoned. If a machine does it, then what? There is 0% risk and 0% exposure for anyone deciding to use a drone for murder. Oh! My bad! The bot malfunctioned. It was on auto-pilot. Oops! We are going to have to debug the software. So sorry.
It is just like robo-voting machines. It is all rigged.
The idea that a robot be used to fight crime is absurd. The only reason to do it is to provide cover for abusive "law enforcement."
[F]orce can only settle questions of power, not of right. - Clyde N. Wilson