The two deer I have lost with my bow still haunts me. I hate the feeling I get when I wait for the proper shots and something happens. I try to learn from mine and not to let it happen again. This year, I had to track a deer for 4 1/2 hours with 3 other buddies. I was ready to give up after about 150 yards of no blood, but then we happened to find where he crossed a fence into thew worked field and we were able to track him by his prints into some thick bruch. We were within 5 yards of him in shoulder high weeds and cat tails before he tried to leave. He was sick enough when he stood up, all he could do is stand there wobbling. I hate those harvests but we all learn from them.
I agree about the road kills suffering for who knows how long before dying. Or the diseased deer suffering for weeks before succumbing to the illness.