Even if you agree to the point of view that he went on the hike ill-prepared, that does not change the fact that he found himself in a potentially life-threatening situation with no other means to signal for help.
Now, the article also mentioned that he left the fire unattended, and that raises the question whether or not a signal fire could have been done with more care. But that is not at all what the court focuses on.
At the same time, isn't the sum of $300,000 influencing our judgment here? Would we think otherwise about the judgment if the damage were much lower, say, around $1,000?