Right now I think the answer is simple but boring - you're responsible for what the car does, even on autopilot. The car does go out of it's way to ensure you're paying attention, it requires you to hold the wheel and, in new models, watches you to make sure you're actually paying attention.

I know Elon is the antichrist on HN so it's tempting to blame him for everything, but personal responsibility still exists. It's your car, you should know how to operate it safely.