It depends on the social circle you are in though if you know very frequently drunk drivers vs responsible drivers. Most people I met in adulthood don't think twice drinking and driving but most people I meet in childhood will tend to discourage it. I don't really know why other than maybe different peer influence? When people see me call a cab they openly say "I just drive home drunk." Like it's nothing. Similarly I've had cab drivers commend me for not driving drunk. "Oh, you called a cab, that's good most people would just drive drunk."

I have co-workers who spend most Friday afternoons (12-5) at the bar and drive right home after like it's nothing. These people don't think driving drunk is a problem.

Personally, I can't understand why you'd go out and drink if you had no way to get home. It doesn't come unexpectedly out of nowhere. If there's no transportation you are still making a choice in the matter. I don't buy excuses, when you choose to go out and choose to start drinking while you are out without a designated driver you are making both choices and making them sober. If it was that taboo, people simply would either stay home or have a designated driver. It's really not that difficult. In fact, I know people who will all meet at the bar and instead of car pooling with a rotating DD they will just all travel in their own cars independently and all drive home drunk.