What "stats" are those admiral? Do present some links so we can check for ourselves.
Already did. Traffic-related death rates in the UK, land of the minicars, are less than half that of the USA, land of the monster cars.
List of countries by traffic-related death rate - Wikipedia, the free encyclopedia
All you've done is tell us what we already knew, that big cars crush smaller cars. You've ignored the effects of what happens when all the cars are smaller, which is what the USA-UK comparison shows. If your theory was right, the UK should have the higher death rates, but instead we see the exact opposite.
Hmmmm, could it also be that the roads are smaller thus dropping the overall speed of all vehicles involved in a crash? You can find videos of two small cars crashing and neither one is in good shape after the accident. The one variable I can find is the speed of the accident which is higher in the US.