Or we can allow Google to have the same amount of accidents as regular drivers and not penalize them if they don't go out of certain margins. let's say if the vehicle has 1 accident on every 10m km travelled - google can go on. Sure, some people may die, but each accident will contribute to safety of the system. So called "Antifragile" property.

Then you give users of the service a choice: maps where service was very reliable, where some accidents happened or where not enough data was gathered i.e. there can be problems. Let users decide where they want to go and what level of risk they are willing to take.

Maybe we can have a device (smartphone?) that serves as marker for vehicles and helps them identify people/dogs/properties around them. If you ask me this can be done even now.