I don't think the point here is some righteous/virtuous one. The argument is that alcohol causes billions of dollars in increased health care costs and decreased productivity, and is a leading cause of death and other health issues.
I'm all for dropping restrictions on things that people can do that don't harm anyone else, but frankly I don't care to spend more money on health insurance because a bunch of people want to drink too much.
Maybe expand the mind a bit, visit a strict Arab country or something. They don't drink much there. Has nothing to do with health though. It might help get a picture what kind of society they are advocating for.