I took it as the author believing that Schumacher was stupid, irresponsible and that skiing off-piste is something that no upstanding member of society should do. Seriously, "from-the-gut feeling of rage that it was all so preventable … it’s just as irresponsible and impossible to neglect to note that the whole thing should never have happened."
He's not just noting that you are assuming a greater risk. It's that it is foolish to do so. Well, swaddle me in bubble wrap and short-rope me to a ski patrol so I don't do anything stupid--or fun--ever again.
Yeah, I think maybe I was being a little too charitable. His rhetoric does seem to suggest that he thinks skiing off-piste is something that reasonable people simply would not do.