I was going to resist chiming in (piling on?) here, but Nestle is indeed a rather large part of the problem, as are all the tree nuts that are grown in places that they shouldn't be. Tree nuts use a massive amount of water, and in a place where three arid states are fighting over an increasingly dwindling, single source of water. The whole situation is completely unsustainable, and I wouldn't worry so much, but running out of water there will have massive repercussions for the rest of this country.Sorry, the water belongs to Nestle.
In addition to golf courses, why does Vegas allow a place like the Bellagio to be built? Wait...I think I know the answer to that.