All of the cameras, public, private, etc can be made to be able to be operated by one operator (for example, the police, the feds, etc.) so that they can see it all and this is already true in some large cities. And of course there are the drones - - did you see the video on what a drone can see (a bird) from 17,500 feet?  Perhaps we have enough cameras and that is only one reason why we don't need the red light cameras. It is a mistake to think of all the various cameras as separate and unrelated to each other.