Bad shots will happen even to the most veteran hunter. Not sure what this would accomplish. One, rarely do I not get my arrow back even if I do loose the deer. Two, it opens the door for scrutiny from those wishing to hurt hunting.
For instance, lets you did have a bad shot and hit a deer in the head, hit a twig for instance. Let say an anti-hunting group pushed and pushed to have the book thrown at you. A new hunter might be hesitate to go in the woods after that.