IMHO, if we are going to fine people for requiring rescue services, it seems that the people should have to be guilty of "reckless" behaviour, not merely negligent behavior.
Anytime that something goes pear-shaped, there are always a lot of lard-butt Monday morning quarterbacks who will opine that it was "negligent". Let's not let the bean-counters take over everything.
And, while we are on the subject, why isn't there the same level of indignation for non-wilderness "negligence" requiring rescue costs, such as people who run space heaters indoors during the winter and set their houses on fire?