Are they? I have not experienced this myself. The Americans I met seemed to have the same position towards DUI as the north-western and northern Europeans I know: it is a bad idea which leads to needless accidents, injuries and death. Being a north-western European living in northern Europe I know far more of the latter two than I know Americans but, having visited the country many times for business and a few times for pleasure (north, south, east and west) I haven't met anyone who considered it 'OK' to drink and drive even though I did meet a few who did so anyway. The same is true for the Europeans I mentioned, some do get behind the wheel while they know they shouldn't.