The very notion of protecting "endangered" species goes against nature. If they can not adapt and evolve to the world they live in then they no longer are fit for survival. Look at Pandas, they absolutely refuse to -blam!- and repopulate. Why should we bother trying to help a species that doesn't care about themselves?
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if we -blam!-ed the species over then we have a duty to help it back on its feet. if they're in a position like Pandas are then i really see no reason why we shouldn't let nature take its course.