They don't drink an drive, they don't eat and drive, they don't talk on their phones and drive (well I can't speak for EVERY person)
I wouldn't generalize that much.....there are plenty of DUI cases over here (limit is .05 BAC). And I admit I talk on the phone while driving often enough....(would be a 40€ fine).
But I wasn't saying Americans were less responsible....it was more of a question. I can't really imagine Americans are that different that it would create a huge problem. Maybe I'm wrong though, and it's a cultural thing that only works if it's always been that way.