Just to add. In a world where airbags are not mandatory,(autopilot+airbag) driverless technology would be safer than the average human (without airbags) on the road. So, you would be arguing for legalizing driverless cars completely overlooking that the gains are not because of driverless-ness but because of airbags. This holds true now too, almost all gains by driverless-ness can be had by emergency braking, lane keeping assists, side collision warning, and pedestrian detection etc.