There is not a single reason for any human to get access to alcohol to drink.
Edit 1:
Just to add the people who say that banning does not work is like saying banning guns does not work because people is going to find a way to get them or like saying we should not have speed limits because it does not prevent people from speeding. (Their opinions does not make sense to me)
banning alcohol only reduced LEGAL AVAILABILITY, people will still be able to make mass quantities of alcohol for sale, these products will almost certainly not be up to standards of local health and safety originations and will result in more harm than if purchased through a legal source.