It's a constant tug of war trying to balance the good and bad of killing an animal. Coyotes for example. A lot of people have no issues with killing coyotes as the coyote preys on fawns and calves and domestic livestock. On the plus side for the coyote I struggle because after all they do eat cats.
Moral issues and hunting go hand in hand, Nearly everyday someone on this forum is trying to tell others what is 'right'. The next day he's being told what is right by the ones he trid to save the day before.
Morals and ethics are things that are very personal and really only mean anything when they guide your conduct when there is no one around to witness your actions.