Do you count skyrocketing murder rate and gov't-poisoned hooch in your metric for success?
Obviously alcoholics can't just "not drink", but prohibition was never going to be a pleasant experience for them.
Soa decrease in deaths of cirrhosis is beneficial, presumably as it extends lives. Is the extension of life an inherent benefit? If you lived for 10,000 years in abject misery would that be better than dying in 6 months? Clearly, it's conditional.
Life is complex, every life is unique, so you can safely assume you aren't going to make things better when you try to violently protect people from themselves. If you were arguing about the drop in domestic abuse that'd be one thing, but cirrhosis from alcohol consumption is self-inflicted. Universally falls squarely in the "mind your own business, jack" space.
See also the very entertaining book by Daniel Okrent.
This stuff is documented, so you don't actually have to deduce it from first principles.
Didn't all those things happen in other countries which didn't implement prohibition? Are you sure it wasn't a natural evolution of society rather than a direct cause-effect from making alcohol harder to get?
I don't know about that, didn't lead poisoning go way up?
1: http://www.vox.com/2014/8/8/5975605/alcohol-prohibition-pois...
Prohibition ruins people's lives, when they are sent to jail, marked as felons and excluded from the job market. We spend billions and billions of dollars enforcing these laws. And believe it or not, many people just enjoy drinking, and do it without any negative consequences to themselves or others. You can't ignore all of that and say prohibition is justified just because it (arguably) improves things on a single dimension.
I think that the kind of people who would agree with prohibition at any cost are followers who won't think for themselves, have no knowledge or interest in history or hopes for a better future, and would have happily extolled the virtues of drug legalization if that had happened to be the policy at the time.
These people seem to attribute no value to civil liberties at all.