When I lived in the US I was surprised about how casually everyone treated DUI. In Northern Europe, where I am from, driving after drinking is socially unacceptable in Generation X and younger.
Same experience here in Canada. I used to think it was something rarely done until I started spending a lot of time at bars in my university days. Every night, I saw countless people driving home drunk, and often the same people too. Even though the bartenders knew and were legally liable, they never said a thing unless they were stumbling down drunk.