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)
Reason 1: Because I want it.
Thankfully, I don’t drink and not planning to.
Thankfully, no one is forcing you to.