That "nanny state nonsense" witnessed road deaths fall from 25 per 100K in 1930 to 10 per 100K since 2010

I think the better metric is the number of deaths per billion vehicle-km. In your metric most European countries have half the deaths than the US, but it's mostly explained by the fact that we drive less. I guess people had fewer cars and drove less in the 1930…

EDIT:

I found the stats: in 1930 you had 15.12 deaths per 100 million miles vehicle, in 2014 1.08. So the reduction is not 2.5x, but 15x!