But how can a rear view mirror help you prevent an accident? Honestly asking here, not being snarky. I don't see how a mirror would help discern between the vehicle that doesn't see you and the one that is about to go around you. You can't see which way the driver is looking with a mirror.

I don't use any mirrors, but I am aware of vehicles behind me by sound and/or headlights. I guess I prefer to concentrate on holding a safe line as far right as possible instead of checking a mirror for something I can't do anything about.