I don’t see that rear backup cameras are a threat to our liberties or a problem of any kind. Often times people in higher vehicles, no matter how much they turn and look, simply won’t be able to see something right behind them. Usually you’re not going very fast when you’re backing up...but it can still be lethal.
I know someone who ran over and killed her own small child in a church parking lot (the child had gotten away from an older sibling) and someone else who ran over but fortunately did not kill a tiny elderly lady who was walking right behind her vehicle in a store parking lot. Both of them were very safe drivers and were going slowly, but they were driving vans or higher vehicles and the simple fact is that there is a blind spot behind these vehicles that could be helped by having a camera.
I’m all in favor of using automation for safer driving. I noticed now there are a few big commercial trucks that seem to have a warning system (probably in conjunction with a camera) to watch the passing lanes so that they don’t pull into a lane when a smaller vehicle is coming up along side. An excellent thing, IMHO.
Sorry, once you have run someone over and killed them, you've lost your "safe driver" appellation.