One of the problems with this is that it inevitably leads to creativity with the definition of "at fault". For example, a few months back an autonomous car lost control, steered towards a parked cars, and crashed into them. The spin in the media blamed the driver for not managing to seize control and stop it from crashing. Of course, what really matters is whether autonomous cars make driving safer, not whether we can blame all the crashes on the driver or a perfect driver would've avoided them.