I was in France for business once in the countryside (southern France), and the host took everyone (me, their employees, etc.) out to lunch. Far as I could tell it was just an everyday thing. Anyway, we drove about an hour to a nearby village and practically partied for a few hours. Wine flowed like a river. Then we drove back and we all got back to our work. So not only were we drunk driving, we were drunk working. Even Americans usually don't drink that hard; the French earned my respect that day, they know how to have a good time.
Also many times in Japan, I would invite a business client/supplier or a friend over for dinner at a sushi bar. It's not unusual for some to drive rather than take the train, and then of course go back home driving after having had lots of beer and sake.
Whether any of us like it or not, drunk driving is an oil that lubricates society.