Well, to be perfectly fair, as cruel as it may seem, if a creature is not fit to live in a changing environment, which obviously requires some catalyst for change, be it human or otherwise, it isn't meant to survive. On the other hand, the counterargument for that is that the way it can survive might be anything, even something like human interference, much like how society exists to guarantee survival and a large gene pool for the human race as a whole.
That said, I realize how cruel that is and it would be better if that weren't the case, but unfortunately it is, and that is how evolution works. In short, it requires extensive deliberation from people far more qualified than us to discuss it. There's a lot to touch on, such as what their presence offers to this now multi-species protective layer of human society among other things.