I have been a skier, and now that i live in FL i'm a kiter.  The danger is just as high on either side, depending on your skill level and your surroundings.
1) Yes he was not smart, but how many have gone off a back side cliff and not looked..
2) There is a harness, but there are 5 safety realeases, including letting go of the bar.
The issue is he was dragged & tossed around like pinata for no more them 90 seconds, he was also knock out or blacked out cause he has no recolection of what happen.
Either way (skier, kiter, surfer, snowboarder, biker) it sucks and hopefully he will recover.
(steps off of his soap box now) LOL