Well the huge difference is, once you put cameras everywhere you can see what people did at any given moment, you can have algorithms that actively look for som

Well the huge difference is, once you put cameras everywhere you can see what people did at any given moment, you can have algorithms that actively look for someone and tracks all of his movements. If you don't see the problem with that then I don't know what to say. Sure humans can recognize people, but they can only "scan" for so much people in a crowd, they do it "live" and they don't remember everything they see.