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And of course the pragmatic reality is that nearly everybody considers themselves "better than average."

Tesla isn't merely competing with the actual average human driver, they're competing with the average human driver's unrealistically rosy perception of their own driving prowess.

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It's not necessarily unrealistic. It only takes one terrible driver to drag down the mean and make everyone else better than average!

A good example of how nearly everyone can be above average is number of arms. If, like 99+% of the population, you have two arms then you have an above average number of arms.

Yeah, no.

Driving skill is almost certainly normally distributed, and if so, your answer is wrong.

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