Have you studied prohibition in the USA? People don't stop partaking in vices that are consumable when they become illegal, they just turn to illegal means to obtain them. Prohibition in the 20's led to the rise of organized crime, drugs won the war on drugs, and in countries where alcohol is banned it just means the rich can partake while the poor go to jail.

Also humans are more than their immediate biological bodies. They are part of communities and cultures that may have deep ties to alcoholic beverages as part of their heritage. British pubs, Christian wine, Mexican pulque, Mongolian Airag, and numerous other examples are essential for cultural and community cohesiveness going back for miilinia. It is ethnocentric of you to dismiss their needs and identity for your convenience.

I say all of this as a son of a junkie. I've witnessed first hand the destruction of personal prosperity and the husking of the human soul that comes from imbibing narcotics. I also wish I could put the evils of decadence back in Pandora's Box, unfortunately it was opened way before civilization existed.