It is not just the speeding that causes all of these deaths.
It is driving skills as well as the training and testing for those skills.
When I drive in the UK, I always set the cruise control to just under 10% over the speed limit.
On motorway, the speed limit is 70 mph.
Cruise control set to 75 mph.
I am always the slowest vehicle on the motorway.
Everyone else is speeding past me.
BUT, the training and testing of drivers in the UK is pretty good, so the driving skills are usually much higher than those here.
Result, less deaths and accidents.