I have come to believe that worrying about an animal's suffering is not necessarily a positive thing for hunters, who want to produce quick kills and recover injured animals. Introducing undue human emotion into the equation can be a formula for problems. I've noticed after 40 some years of hunting that the guys who are total predators when on game, are the same guys who get their animal and have the fewest losses. I strive to be a stone cold predator when it's time to kill an animal. I may let my emotions play into the situation much later...but I keep them out of the picture until the animal is recovered...or not.
If you hunt, you are trying to kill. Killing with an arrow often takes time, which means an animal is alive but dying. Some animals will not be found, and others will not die. Some guys get emotional over this and some don't. I'm in the latter group. The death (or not) of an animal has just never played into my emotional psyche.
For me, the best I can do for the animal is to be efficient...and that means not letting my feelings get the best of me.
Great topic!
Kevin