A leading cause of premature death in the US is car crashes. Car crashes are in almost all cases caused or exacerbated by operator negligence. That negligence is not caused by desperation/greed/fear/lack of empathy, but by a confidence that one won't get caught or punished.

I can't imagine a better way to deal with this problem than with cameras that can detect these behaviors and issue citations impartially and consistently.

It's totally possible to implement a system where cameras do this but do not record enough data to amount to consistent surveillance of people who aren't acting negligent (i.e. using radar to trigger them), but as long as the conversation is "cameras everywhere vs no cameras ever" these kinds of compromises seem unlikely.