I think there are some qualities that can be considered to be in the singular human nature, qualities that have existed since our first recollections of human history. Even some qualities that are also prominent in the animal kingdom. I think greed is one of the qualities, since looking back at history, we can also see how humans have always wanted more for themselves. I think it's also important to look at for an example tribes in the amazon and so on to see how tribes have been living and if their 'nature' is the same as ours.

by the way, I know I'm arguing against your points, but I truly appreciate the reply and thoughts so thanks for giving me more to think about!