Earlier quoted context omitted.
It has always amazed me how casually people drink and drive in some countries; the US especially springs to mind. Over here, drinking and driving is an extremely shameful and embarrassing thing to do. I would say it's on par with hitting a child. You just don't do it, not to save 20 bucks, or to save you from walking an hour.
It isn't that, the cab rides are never just $20, and often there are no cabs at all. The USA just has crappy non car transportation options. And it isn't just an hour walk in many places, but a few hours walk on dark streets with no side walks. When I was living in the Deep South, I sometimes had to take people home 20+ miles out in the middle of nowhere.
Very hypothetically, if someone else got you drunk in the middle of nowhere without your knowledge and there are no taxis available, and it's freezing outside so that you can't sleep under a bush, then not letting you stay the night at whatever house you were in would be similar to murder I guess. A drunk person driving is just off the table and everyone understands it.