Should simply tell the young one that the history of mankind is one of ceaseless slaughter and savagery in which the ground is soaked with the blood and entrails of the innocents. Then put together a movie night with the family featuring the Sorrow and the Pity, news footage from Pol Pot's Cambodia and the "best of" documentaries of primitive tribal practices. As she sits there wide-eyed in horror, quietly sobbing, you'll know you've done your job.
Native American ping..