Lots of strobe lights, fog and loud noise in dance clubs and bars, but I see your point that people are not jumping out at you at a bar (in most cases :ack
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I have never thought that bringing a child (under 13) was appropriate for the event even without alcohol. Ideally they would only allow 18 and up in the event, but I dont really see that happening.
I have attended 30+ HHN days total and have only seen a handful of incidents , all of which were pretty minor and the UO staff were on it right away. I know that anecdotal, but it seems like they have the measures in place to handle a few unruly guests.
My guess is if they really have that much of an issue with alcohol, they would just cut down on carts and raise the prices to decrease the demand, while keeping the bottom line up.