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When a human driver causes an accident you can assume it's an individual mistake. But with a self driving car you know it's a "collective" issue, every (identical) car would probably make the same mistake under the same conditions since they share the hardware, software, and learning data.

This is an advantage when learning but also a disadvantage until that learning is done. Which is why beyond Tesla's intentionally misleading branding for the AP I consider the drivers are ultimately responsible for controlling the vehicle.