Earlier quoted context omitted.
Biggest factor to control for is drunk driving, which is ~30% of all deaths IIRC.
Good point. I wonder whether the ratio of drunks behind autopilot wheels is different than average. Could be lower (because richer) or higher (because richer).
I'm any case, "statistically more safe" is a weak argument, e.g. we would be terrified of boarding a plane if they were merely statistically more safe than driving (by a small margin).