I've lived in Australia, UK and now California. Drink driving is much more accepted here. In Australia I regularly encountered random breath tests (police stopping and breath testing dozens of drivers at a time) and have been pulled over by a police car purely so I could be breathalised (I was completely sober).
I feel it's much more commonplace and acceptable in the US to drive alone to a bar, drink, and then drive home. Cities are much smaller in Australia and the UK so catching a taxi, public transport or walking is feasible.