two brothers and the blue fin tuna

Why should human beings care about whether the population of blue fin tuna is decimated by overfishing?   Its pretty unusual in the realm of living things for one species to care about the fortunes of another, even though we live in a delicate balance of competition and cooperation with all other living things.  So far as I know, human beings are the only species capable of caring whether or not another species flourishes or declines.  Which alone makes me think perhaps we are meant to care, or that in our caring we are expressing our uniqueness. 
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