Most of those are avoidable plus the rate of long term disabilities is about 10x the death rate (so 400 000) and of minor injuries is 10x that (so 4 million) plus... we can do both. There is plenty of money for safer road infra, DRIVERS JUST DON'T WANT IT because killing a stranger matters less than 5 fewer minutes spent commuting per day.

The same situation is true of heart disease, albeit the risk is generally killing themselves vs a random stranger.

People just run out of shits to give at some point, and do what is easy.

Agreed, especially when the opposition is formed out of several major industries in the country (car manufacturers, adjacent companies, road developers, big box stores, etc.).

I'm not sure it rises to 'opposition' per-se. For instance, I don't think anyone is sitting there cackling about how they're killing anyone due to them being obese fat asses, and figuring out how to make it worse.

It's really macro-economic and social inertia. Those sedentary folks have also convinced themselves they LIKE IT, and there is room (and real economic incentives) in the US trending in those directions. Like low property prices in the 'burbs, cheap gas (by global and economic standards), etc.