You need to look up Category Error. Cuz you HaZ it.
In conflict situations this primitive, midbrain processing can be observed in the existence of a powerful resistance to killing ones own kind. Animals with antlers and horns slam together in a relatively harmless head-to-head fashion, and piranha fight their own kind with flicks of the tail, but against any other species these creatures unleash their horns and teeth without restraint. This is an essential survival mechanism which prevents a species from destroying itself during territorial and mating rituals (Grossman, 1996, 5-6).http://www.killology.com/print/print_onkilling.htm I am no troll you idiot; I'm trying to be Grossman's advocate.