That is how nature made them. They can’t help it. This is how they survive and what they were taught from birth. It is cruel I know. You don’t have to have the warm fuzzies for the beasts but they do command some respect I think. I don’t believe THEY kill for fun or to take a head back to camp and show off what they did.
Now how would you know? Once you have anthropomorphized them, they can do anything man does. Just because you don't see their behavior that way doesn't mean it isn't happening in their minds. And nature didn't 'make' them.
It is cruel I know.
There you go again.