Reasons for shooting at live animals can either be for Vermin Control, For the Pot (hunting for food), or for amusement. The first can claim the moral high ground with it being a necessity for disease control and farm management, the second console themselves that they 'eat what they kill' (though there may be better ways of obtaining it), but the third really have to question their motives and whether shooting paper targets might not be a more humane pastime? Many try to combine reasons 1 & 3 or 2& 3 to excuse the act.