per capita is a bit weird, maybe people in the UK don't drive as much.
One thing that is not being discussed is that cars have become a lot wafer - for both people in the car and for pedestrians they might hit.
Combine that with an obsession to make cars available to anyone, even if they are known dangerous. Look up videos on YouTube of police pursuits in Florida, Georgia, Arkansas, Michigan. Those aren't exceptions, they are glimpses into a mass pathology. I believe Madison, Wisconsin was tracking multiple police pursuits per day in recent years. The subjects there frequently and deliberately drive on the wrong side of roads to compel the police to terminate the pursuits.