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Other than that... "nature is red in tooth and claw" and such. Nature is far less kind to *itself* than environmentalists want to be to nature. :P
Bizarre to assume that you don't have any obligations to or within a system precisely *because* you're a part of it. Does this extend to families, workplaces, etc? 
To put it in a different way: by the very definition of "nature", humans aren't doing anything that nature itself doesn't do. Would it be "immoral" for species X to drive species Y to extinction? No? Then why does that answer change if species X is homo sapiens?
If humans weren't a part of nature, you could plausibly suggest that this is "unnatural", which is what environmentalists say. Since they are... there's nothing unnatural about a super-predator being a super-predator. We're already all playing by the same rules.
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