I can understand her view on the matter, but as a whole the human race is violent, virulent, and can be a tad sadistic at times. I think expressing such destructive behavior through literature, film, and video games is more healthy than going out and ripping out the guts of gophers. Of course there are individuals who have elevated themselves from the need for base carnage in any form, at it seems that your female cousin is one of those rare individuals. Its nothing bad against her, or yourself. It is just how, as individuals become, things are.