How about non-civilized humans? I agree that "civilized" should no longer be a term of praise. But there are still a million humans who are not "civilized" and still live pretty close to non-ecocidal Paleolithic ways. Are they, in your view, exempt from the omnicidal tendencies of the civilized? 

Non-human animals that overpopulate generally suffer catastrophic die offs since they evolve on/occupy ecological niches with finite resources.