Edward I'm sorry to have to disagree with you, but in this case I couldn't disagree more.
Human beings are much, much,tougher than most people think. I've seen a lifetime worth of mangled human bodies. Two decades of trauma nursing.
Bears have tougher hides and stronger bones but they do not have a human brain and in my experience that is what changes everything.
I've seen people who no one had any idea why they were still alive awake and cracking jokes with the staff while we feverishly tried to keep them alive. Saw one guy who had been in unimaginable pain for 12+ hrs who held off going into shock just long enough to make it to the ER with a family member driving who was still laughing with the nurses as he finally let go and lost consciousness.
The will to live, the closest thing to real magic I've ever seen.
Gaily bedight, A gallant knight In sunshine and in shadow, Had journeyed long, Singing a song, In search of El Dorado