This is nothing new. The laws have been on the books for years and years. It's been against the law to serve a drink to an obviously intoxicated person. Bartenders and bar owners have been sued by people who have been injured by a drunk driver for serving them when they were obviously impaired. The same with liquor store owners.
If people want to get falling down drunk, drink at home and go to bed.
Presumably, you would support those people being arrested at home as well if they had a car in the garage that they could potentially drive in? In order to prevent the possibility of drunk driving deaths?