>"The US..."

Except laws or strongly enforced social norms surrounding homosexuality, race, etc are universal in the human experience and not unique to the US.

Alcohol arguably does "harm someone else" when the alcoholic comes home and beats his family in a drunken rage, or when they lose their livelihood and cannot support their family anymore. It was these real issues affecting people other than just the drinker that the prohibitionists were confronting.