Silicon Valley’s push to create superhuman automobiles seems to be taking a human toll. Tesla’s head of autonomous driving defected to Apple’s car project. But now the head of that Apple project has quit. Engineers are only human, you know. So it seems that knocking people out of the driving picture is daunting enough to knock people out of the “knocking people out of the driving picture” picture. How ’bout we just keep on drivin’ and live happily ever after, or at least until we’re fatally broadsided by an exhausted engineer.