Okay. Utilitarian, but legitimate. Now, the money questions - how do you define Man? And how do you delineate "rights"?
As for rights, sadly, and I mean it, they are a luxury (and thus requiring defence). We do have lawless cultures (and societies) near home, on this very planet, who, by strict definition, have survived as an entity just for as long (in fact, longer) than us, the civilised, have. Now I am not trying to say that the uncivilised are in the right; just that when purely viewed as an entity of nature, their ways have not made them disadvantaged, genetically. Do I approve of their ways, personally? Of course not. Does nature? We don't know, and they don't abort as often as us. What will that lead to? Who wins?
Questions, questions!