Why does the US have such a high highway fatality rate?

The recent WHO study of accident fatality rates per vehicle shows that American cars are twice as dangerous as German cars, 9 times as dangerous as cars in San Marino, but 1/12th as dangerous as cars in Afghanistan, 1/22nd as dangerous as cars in Egypt, one forty-fourth as dangerous as cars in Niger, and one fifty-ninth as dangerous as cars in Ethiopia. The following table is from this study showing the ratio of cars to fatal accidents. iow, there was only 1 fatal accident amongst 51,590 cars in San Marino, compared to 1 per 100 cars in Ethiopia, a difference of 516 TIMES:

Deadliest

1 Eritrea 1/751

2 Cook Islands 1/1782

3 Eqypt 1/269

4 Jamahirya 1/854

5 Afghanistan 1/854

6 Iraq 1/1161

7 Niger 1/133

8 Angola 1/285

9 UAE 1/1661

10 Gambia 1/267

Safest

1 Marshall Isl 1/2487

2 San Marino 1/51590

3 Malta 1/25437

4 Uraguay 1/6566

5 Netherlands 1/11205

5 Singapore 1/3978

7 Switzerland 1/14476

7 West Bank 1/418

9 Norway 1/11158

9 Japan 1/13764

Misc

Ethiopia 1/100

Canada 1/6945

China 1/1503

Thailand 1/2051

South Africa 1/573

India 1/688

USA 1/5896

Germany 1/11217

The original study reported this as fatal accidents per 100,000 people rather than in accidents per vehicle, explaining why the West Bank was included in the safest category rather than the most dangerous category. This would suggest that drivers from Africa and the Middle East are what cause us to have an accident rate twice that of Germany and 2 1/2 times greater than that in Switzerland.