It is important to realize that the theory of evolution is not simply that man evolved from apes, but that man evolved from everything.  According to Darwin, all living creatures have a common origin.  Men, monkeys and bananas share the same ancestry.  As such, when a man eats a banana he is engaging in a kind of cannibalism, consuming an ancestral version of his former self.  Yet he consumes the banana so that he might survive.  He feels no guilt about using the banana for his own benefit.  He will not phone the authorities and report that a crime has been committed, in that he killed the banana and ate it.