Tailgates, the neighborhood etc.
I think that is a separate conversation from whether or not 6 packs are being smuggled in.
But yes, Ute fans drink. a lot. And I don't think that is dissimilar from most college game day environments. In fact, its a lot less in Utah (simply because there are fewer drinkers in the state) than in another stadium I've ever been in, with the exception of LES.