Placing hidden cameras is probably not legal either, unless they had some sort of permit. That being said, I do think that being under the influence is dangerous on the hills. You can seriously injure somebody.
That shack is pretty awesome though -- I wonder how long it took to build that thing.
I'd 1000x people be riding/skiing high compared to riding/skiing drunk. If anything, I dial it back and get a little more cautious when I'm high. 4+ beers though and I usually call it a day for my own good. Too easy to do something stupid when you've had one too many.