Don’t forget the stats-skew. I don’t have data, but at one time (1990’s, and perhaps until today), if a sober driver got into a crash, and there was a drunk in the back seat, it was recorded as and alcohol-related crash. Similar with “alcohol-related” fatalities..
I’m sure there are variables.
At the end of the day, we had a pretty big problem of drinking and driving.
It was socially acceptable until about the mid to late 70s.
What I mean by that, was there there was no onus on folks not to. The laws weren’t that stiff. Then things got a lot tougher.
When they did, that too reduced the number of drinking and driving accidents, but isn’t statistically calculable.