Even if we disregard the controversial bullet and shot toxicity problem, I think wildlife deserves that we handicap ourselves a bit, especially since nearly all humans now hunt for sport or occasional table fare, not for commerce or survival. After all, wild animal escape mechanisms are unchanged, while our ability to kill them has steadily increased.

On the other hand, keeping traditional muzzleloaders legal with lead balls seems justified as they seldom lose weight on impact. I don't know if saboted solids are available, but they could be the answer for people who wish to keep hunting with calibers for which solids are not currently manufactured.