Actually... simple point.

You take a corner, there is a defect in your tires so you cant turn well, you hit someone, the investigation shows the defect in the tires. Who pays / is to blame?

I'm not saying the trolley problem style arguments aren't true for driverless cars; society will need to adapt. I just think having the companies pay still gets us to safer roads but with accountability and without society hiding the costs these companies impose