Look at it this way: alcohols are intrinsic building blocks of the human chemistry. Of course they are going to potentially afford man with some positives, one of which seems to be this.

This article does a nice job outlining alcohol's role and why it might be better for us than many critics have long thought:

http://www.beer-universe.com/beer-education-article/2009-06-09/Beer-An-Organic-Boon-or-Bust/