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I refuse to believe it is human nature to be greedy. We are social by nature People are not necessarily greedy --- you miss the point for the word. People act in their self-interest. And, incidentally, they are social only when it is in their self-interest.

even some of my atheist friends live such that they treat others always as they themselves wish to be treated. This is because the atheist friends internalized the product of the Judeo-Christian morality into which they are immersed, although they chose to dispose from its source.

Once internalized, these values constitute your friend's preferences, which they, in turn, implement in their behavior.

[TopQuark]

riend's -> friends'. Sorry for my poor hands coordination.