It's not like everyone who snowboards doesn't know the rules. He violated them out of stupidity and a greedy desire to either show off or get his adrenaline fix. He was grossly out of line if he was traveling upwards of 40mph. I've never been on that run, but I also feel he must have been incorrect in saying he could not have avoided the crash.
I hope he is being honest about feeling shame and grief for what he did. It's the most just part of his punishment.
Rome Design 165 / Rome Arsenals
Rome Anthem 158