Many people argue that we should allow nature to take it's natural course. It is not our duty to help those animals who cannot help themselves, besides, we're at the top of the foodchain, why should we care? Does our position at the top give us the go ahead for mass extermination though? A lot of the animal's are endangered because humans have encroached on their land, their homes, or, in the case of the whales, have been hunted to near extinction for their blubber. Although, personally, I'm not sure that we should save certain animals from extinction, it does seem our duty to fix what problems we have caused.
It is incredibly costly to save endangered species. Billions upon billions dollars go into building habitats and breeding programs. It seems that some cases just can't be helped. Those are the cases that should be abandoned. Survival of the fittest does need to play in somewhere (I'm looking at you, pandas).
So, should we do anything about this? or should we, collectively, say that animals should learn how to solve their own problems and save their own furry behinds?