The instances I've encountered where people steal marijuana or alcohol usually consist of people stealing the actual marijuana or alcohol, and in a lot of those cases it either went unnoticed, or if it was noticed it was shrugged off (i.e. "Oh, maybe I drank those beers and just forgot, whatever.")
Contrast this with blankets spread out on the sidewalks of San Francisco containing random household items for sale such as phone chargers, or kitchen utensils. It's pretty clear that one group is willing to go to greater lengths to obtain their fix than the other.
Edit: I want to acknowledge again that alcohol can and does ruin lives, and there are probably kids going hungry because their parents spent the last of their money on alcohol instead of food. My main point was to contrast this behavior with the behavior of people who steal in order to obtain hard drugs. While both are bad, they do look different in important ways.
There are a lot of secondary costs too (traffic fines for drunk driving, especially if they cause an accident, stuff destroyed while drunk, etc.)
But yeah, our national anthem is a part of a drinking song... so yeah.