"The question is whether self-driving cars, even with the errors, are safer for people than regular drivers on average. If so..."
You could say "the question is whether aircraft, even with the errors, are safe for people than regular drivers on average. If so..." - then how should we change policy towards Boeing in light of the 737 MAX fiasco? Should we then avoid any adverse action towards them and focus on encouraging more people to fly?
If we declare that something is safer, particularly before it even exists, isn't there a danger of a feedback loop that prevents it from being safer?
Regular drivers kill people, but they are also generally vulnerable to the crashes that they cause. Boeing engineers, or the programmers of self-driving AIs, don't have their interests aligned with you, the occupant of the vehicle, nearly as much.