How do you conclude that? GP’s premise amounts to “if the overall rate of human crashes per million miles is H and the autopilot rate is A, even if A is half of

How do you conclude that? GP’s premise amounts to “if the overall rate of human crashes per million miles is H and the autopilot rate is A, even if A is half of H, that doesn’t tell you anything about the relative safety if autopilot is engaged during a particularly safe subset of overall driving.”