> deaths by people driving normal cars/normal cars on the road vs. deaths in automatic cars/automatic cars on the road, by the hour on the road

These are not qualitatively the same. Drivers have a lot of control over their individual accident rate, by driving more dangerously or more safely. I want to know if the automatic system is safer than me, not just safer than the average.

And to state the obvious: the appropriate regulatory reaction to a death caused by AI is not "charge on" but investigation and improvement.