I am not a heavy drinker at all. I can quite happily go out and not drink. In fact I haven't been massively drunk for several months and get on fine socialising and dancing just on Orange juice or Coke but from experience it is generally more fun when I am drunk. So why wouldn't you get drunk when there are so few downsides and have more fun? Personally my main reason is cost and not wanting to feel ill the next day. but not drinking at all. everyone can manage a couple of pints without becoming a blithering idiot, going bankrupted or raging alcoholic. Man up.
I just can't understand why it wouldn't be the same for anyone else unless you were a homo.
For me It's just something else to do. If I was content watching TV, riding my bike, playing football, playing computer games etc then I would do those but sadly most stuff I like doing such as going on far away holidays, skiing or fast cars costs money so although I do that when I can, beer is cheep fun and makes most things more enjoyable.