Seeing you are from Australia might explain. Perhaps there are different standards there as opposed to the states. In the place where I live hunters are expected to harvest their game and in many states there is a wanton waste law used to prevent someone from shooting a game animal and leaving it. I have too much respect for an animal to just shoot it and walk away. If the pigs couldn't be recovered you shouldn't have shot. I have a feeling you are young and since your father was part of it then you were only doing what was taught. If that is the case I feel sorry for you. Good sportsmanship is the cornerstone of our hunting heritage.