Driving Miss Dozy in the USA

We were hit in the rear today by a lady in a shopping parking lot. We were stationary at a stop sign. She did not see us I suppose.

Why in the UK and Paris do so few cars have dings and scratches on the bumper?

Now take a look at my bumper... scratches all over. Why does this happen so often in the US? Could it be because so few people here are engaged in driving as their primary activity, while driving?