That was fucking stupid. I don't mean the documentary but the risk that they were exposing themselves to. I don't know what direction I want skiing to go (and I certainly don't think I am the one to suggest one), but out of a basic respect for life and the consequences of quick little thrills like these, I hope this isn't it.
I hope that Cam understands what could happen. Look at any of the big skiing injuries like Pekka's, and he wasn't even trying to up the danger factor, and it is easy to understand what can happen. These guys seek out rails for the danger. Just because they have gotten lucky so far doesn't mean they will tomorrow, whether it's paralysis, a head injury or death.
Finally, for the guy in that who was suggesting that it was good for him to be at these rails supporting Cam- you are just an enabler, tacitly agreeing to let him put his life at risk. A good friend would tell him to go home. Try to do awesome shit on your skis, but never purposely up the danger for the sake of danger. Do the same shape and length rail somewhere where you are less likely to die if you fall off.