This is exactly why the self-driving car vendors should have full liability for accidents. There's no bigger incentive to fix the issue if everyone sees them as the guilty party, and they can't just get away by pointing the blame at someone else. No other regulation is going to be as effective as this in making sure self-driving systems work exactly as intended with the absolute minimum of accidents.
I agree, besides everybody want self-driving cars to reduce accident rate.. This should succeed.