It's not even the tinfoil-hat issue, it's standard emergency issues. Think of the damage a hurricane does to wide swaths of coastal land. Think of being trapped in Napa last fall during the firestorms. Think of a bad blizzard or a lucky lightning bolt to the right transformer. At least once a year, I think there is a sizable portion of the US population, let alone world population, that needs unconnected emergency ready transport in under 2 days notice. Expecting people to pay $30k+ for a car and not have that baked-in is a no-go.
This is why I think it's crazy that AT&T is trying to take down all their copper POTS lines which have traditionally been seen as an important asset in a regional emergency.
If that happens, car crashes aren't the problem - it's the widespread famine that follows in a week's time.