I believe that a lot of what is ethical in hunting comes from the sporting ethics of the English. I believe an example is that if trout cannot be caught using a dry fly cast upstream then they simply cannot be caught that day, and anything else is poaching. I rather like their sense of fair play. I have hunted with others where the sense is to kill an animal no matter what or how. I have not found these hunts to be as enjoyable. I guess it's a personal decision and as long as I am comfortable with the ethics of a particular hunt and hunting partners and assuming it's legal then I am ok with it. We all can kill, it is the chase or 'sport' of hunting that keeps me out there.
WR