The fact is that hunters place their best shot to kill the animal. Many times that shot does not kill the animal immediately. In most cases, the animal runs off to die from blood lose. As a hunter, I've had to place a second shot through the heart of the animal I was hunting, because my first shot didn't kill the animal. Bow hunters NEVER kill the animal immediatley. They all die from blood lose.
If you've ever been upland hunting and shot a bird, sometimes you have to ring it's neck because your shotgun didn't do the job perfectly.
So, these two sports are a little more comparable than you might want to think.
Jim Smith