We, human beings, as a species are flawed. Not only in the evolutionary aspect, (what animals have you killed with your bare hands lately for pure survival?) but in the ethical aspect. We're parasites, and we've expanded on this by creating an artificial environment for us to live in that is itself a much larger parasite. Though I suppose maybe we aren't parasites, but simply rely on a parasitic construct we've built to sustain ourselves. The problem with this construct(society, civilization), is that it is both parasitic and poisonous on a very large scale.
It has and does wipe out entire ecosystems, entire species, only to intake the life