The thing about banning alcohol is that it is based on a a ludicrously unscientific notion, which is that there are no negative implications from not serving alcohol.
For example: what about the irritable passengers who are annoyed by their fellow cargoists, yet who can relax a bit with a drink? If we take away the booze, will the level of stress on the a/c increase or decrease? My *personal* view is that alcohol is used by a great many people as a stress management tool, which is why people who drink in moderation are (apparently, according to the NHS) healthier than those who don't, despite ingesting all that icky booze.