Probably more related to the god-awful infrastructure design in the US, like stroads and an unfathomable tendency to use stop signs for a lot of things they are just not fit for, like to replace speed bumps, chicanes, and roundabouts.
Also the better comparable statistic should be deaths per distance traveled in cars.
You think this is something? You think this is bad? This? This chicanery? He's done worse. That billboard! Are you telling me that a man just happens to fall like that? No! He orchestrated it! Jimmy! He defecated through a sunroof! And I saved him! And I shouldn't have. I took him into my own firm! What was I thinking? He'll never change. He'll never change! Ever since he was 9, always the same! Couldn't keep his hands out of the cash drawer! But not our Jimmy! Couldn't be precious Jimmy! Stealing them blind! And he gets to be a lawyer!? What a sick joke! I should've stopped him when I had the chance! And you - you have to stop him!
No, crashes in the US happen because Americans are shit drivers. They are shit drivers because you get a free driving license with box of cereal. Germany on the other hand has one of the strictest driving tests there is. A German with a driving license has had many hours of instruction from a professional instructor.
In addition, American cars are shit. Lots of poorly maintained and unsafe vehicles on the road with very lax regulation. By contrast, German cars have to pass a very comprehensive yearly safety inspection.