Social media only seems to have psychological side effects which aren't as openly visible to our eyes.
It seems obvious to you because it has been made obvious to you. It wasn't the same for people in the first half of the 1900's. The parent comment is making the same point: it's not obvious to most people today, but in fifty years from now, people will look at the research, the decline in the birth rate, the increase of anxiety, and effects we can't imagine today and go "social media has very visible side effects fairly soon, how did they not know?"
My closest bar is 100 meters away. If I'm willing to walk 20 minutes, the radius can probably hit around 100 different ones.
If you are drinking more than that across an evening I would argue it's a bit more than socialising. Maybe where you are from people are heavy drinkers and are not responsible enough to not slow down a fee hours before you know you will be driving but I feel like the quarter a million annually is quite overrepresented by heavy drinkers.