If a human crashes and their action/vehicle is responsible for the crash, the crash should be attributed to the human (excepting mechanical failure, etc). I believe that if an advanced safety systems, such as automatic braking, that prevent a crash that otherwise would have occurred, the prevented crash should also be included in the human tally. Likewise, if Autopilot would have crashed if not for the intervention of the driver, the prevented crash should be attributable to Autopilot.
As has been often studied, the major problem for autonomous systems is that until they are better than humans WITHOUT human intervention, the result can be worse than both. People are much less likely to pay full attention and have the same reaction times if the autonomous system is in full control the majority of the time.
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https://beehaw.org/