Actually consumption of alcohol increased during prohibition and decreased slightly when it was repealed.
Decrease in alcohol consumption and the negative effects was never a goal of prohibition.
The one terrible legacy of Prohibition was the destruction of the American craft beer industry. We were stuck with crappy beers like Budweiser up until the 1990's, my entire childhood sucked, you cant take that baaack!
prohibition had 1 real goal to decrease alcohol consumption and the negative effects associated with it. It accomplished that with very minor negative side effects that have been overblown in an attempt to justify getting rid of drug prohibition.
How can you know how much illegal drinking got done during Prohibition?
And we made an entire generation of criminals from low-end thugs into millionaires.