I find the absence of a distinct human nature from the rest of nature hard to believe. Your point is valid from the points you made, but you do not consider everything. Even Jane Goodall, the famous biologist, whose work with primates has been extrordinary, would not agree with you on this one. There are distinctions between a human and another animal, such as an ape. Man has the ability to reason in a far more complex manner than any animal, and has developed language. The latter is especially important as it allows for the former to occur. Jane Goodall is enammered most definately with the monkeys she studies, but does concur that there is a difference from humans emotionally, physically, and mentally. As to the nature that you describe (which is more emotional/mental), it is true that animals (such as apes) exhibit anger and do fight, even to a point of a primitive war-like style. However, their ability to comprehend what they are doing is very limited, more instinct than comprehension. Man does comprehend his actions, and so the idea of motivations comes into play in a more real manner. Man's nature is distinct in its greater complexity, as well as in the integration of the spiritual; no ape has or ever will contemplate (or even has the ability to) its origin and end.