There are many good arguments I think, but not this one. Nature is eating your neighbor's children; it's starvation, epidemics, and massive forest fires; it's unrestrained homicide and rape; it's leaving your physically weakened child to die; it's eating the head of your spouse; it's survival of the fittest; ... (you get my point).

The other animals in nature are not my standard of behavior. In a sense, the point of any culture is to exceed nature and by as much as possible.