Eyeborgs (2009)

In the future, the government employs cameras to fight crime.  Cameras are everywhere, including in robots called eyeborgs.  When a crime is committed, cameras capture everything that happens, and the eyeborgs are used to stop the crimes and convict the criminals.

Detective Gunner Reynolds and a reporter grow suspicious when video footage of a murder scene doesn't match what they remember happening at the scene.  They realize that those who oppose constant supervision are considered threats and enemies of the state.  So the government justifies disposing of these people by using fake footage manufactured  by the eyeborgs to cover their kills.

So who is watching the cameras?  Not only is there the question of whether to government has a right to disregard the publics privacy, but the logistical question that if we need people to watch each of these cameras covering every living  person, then the work force is going to be ridiculously huge.

The killer robot eyeborgs are actually kind of cute, which makes them less threatening.  Danny Trejo appears as one of the rebels.