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Well, taken to a philosophical extreme, that’s true in all cases, including all forms of altruism. But there are far too many daily examples of natural human goodness for such “self-interest” to be a simple explanation for such aberrant behavior.
And that’s what it is: aberrant human behavior, not natural human behavior.
It's beyond the scope of this thread, but I don't think altruism really exists. It think the vast majority of times people do good things for others only if it has some benefit to them even if it's just that it makes them feel good about themselves.