R232, R234 is right. In the U.S., a group of mothers whose children were killed by drunk drivers became a powerful lobbying group and got laws changed about drunk driving.
If you go back a few decades before that, television shows in the U.S. used to have comedy skits about how funny drunks were. Not any more.
The laws were gradually changed to make drunk driving penalties much more severe, and it followed that society in general found drunk driving much less acceptable. Then the concept of the “designated driver” came into play, a person who stayed sober so the others could drink as they pleased, and the sober person would drive them all safely home.
People in the U.S. still drink, but some social ideas have changed. Anything having to do with getting yourself into a situation where you are going to drive or operate machinery drunk is thought to be selfish and showing a lack of good character, because of the innocent people that often suffer due to doing so. People are much more aware of that now, after many publicized cases of drunks running over kids or crashing into cars full of families and killing them all.
In most of the U.S., public transportation is not great, and cab rides can be very expensive, due to long distances, so drinking without a designated driver can be cumbersome.
In LA, it’s almost impossible to drink without somebody driving you home, and that’s where most of the TV show writing is done. TV has had a big influence on how people see drunk driving. It’s not uncommon for people to meet up at a bar or restaurant thirty miles from home, with no bus available. Transportation adds to the cost of drinking.
After a couple of DUIs, they yank your driver’s license, which means you’ve probably just lost your job, since you can’t get there either.
People from other countries don’t realize how big the U.S. is, as far as commutes and other reasons to travel. If you stop at a bar after work, you may have an hour or two commute ahead of you, especially in California. You can’t drive that far drunk.