Numerous studies have shown that habitats in which there are greater diversity of species are far healthier than the ones which have limited numbers. Furthermore, if you want to be selfish, animals have a lot to offer humans. We can study them to learn about diseases, we can compare our closest relatives and learn what it means to be human, we can have companionship in ways which fellow humans can’t offer (I’d eventually get sick of my friends living with me but I don’t mind my pets always being around), and provide many other useful functions.
Because of this I am one of those people who would kill a junkie for the tigers in that hypothetical situation. I also support limits on human population and animal sanctuaries. I do this because that’s what you do in other situations where one species is causing the dramatic destruction of another. In Hawaii I worked to kill off species which were threatening the native ones. I do not harbor any illusions about the state of mother nature because “good” and “evil” are constructs which can only be applied to the human race. Does something have to be “good” or “not evil” for us to save it? So what if animals are inherently violent? At least they have an excuse. Should we not try to stop the destruction of chimpanzees because they hunt other animals as well as each other? I think this is one of the reasons why we should save them.
The ones who say that people like myself should kill ourselves or our family and friends make me laugh. That would make things worse because people would still go around killing animals. Instead, I work for alternatives. I donate money to funds that try to give the humans in the areas where the chimps live alternatives to killing chimps for money. I support population control (which normally comes anyway after education). When animals come into human lands and cause destruction then I support the killing of the animals. However, when people push into the animal’s space so far that the animals start harming human possessions or even humans themselves in order to stay alive I have no pity for those humans just as I don’t have any for those who build in geologically unsound areas.
Humans are smart so we can learn to live with minimum cleansing impacts on other species. If people refuse to do this then I have no problems with their destruction. However, I believe most people will realize the benefit of having a diverse ecology.

I don’t get the joke, please let me in on it?