Structure as appropriate for the potential for public harm. If necessary, make it required that an executive sign. If you can’t trust your executives then you shouldn’t have projects that can harm the public. They could have killed the Camry driver.

No, but making an example of him would have reduced the incentive to do it again.

Also, removing him from the the tech lead position would have helped prevent further incidents.

>>None of those would stop a tech lead or engineering manager

Then something else should. Imagine one guy, gone nuts, changing the code on millions of vehicles in one shot.