Avu wrote:How is that proof of us not being evil?
That is precisely what it is, but maybe you're mistaking it for an attempt to prove us as inherently good? The two are not each others' antitheses. You ascribed it as something evil in our disposition; what I tried to explain is that it is neither good nor evil, but simply part of a mechanism removed from the moral dimension. It is neither moral nor immoral, but rather amoral.
Avu wrote:There can be no true altruism
This seems to be a common source of confusion. There can, indeed, be no "true altruism" if you, by "true altruism", mean acting in someone else's interest rather than your own. That is precisely what I explained. Let me repeat it, just in case you overlooked it: It is true that humans are egoistic (and that's a fact, not a generalization) and put their own well-being above everything else, but that is precisely the reason why we care about others, too.
This "true altruism" of yours is a completely meaningless concept. If not acting in favor of our own well-being, what would exist to motivate us, at all? Consider, if you will, an entire society of "true altruists": everyone would want to act in the interest of others, but since noone has any interest of one's own for anyone to act in, there is no action left for anyone to take. Such a society would stand completely still. An egoist would be required to move it.
Acting in one's own self-interest, on the other hand, can only seldomly be described as evil (of course, the mechanism as such is, again, neither good nor evil). Consider, for instance, an act of barter: The tailor and the baker exchange a piece of clothing for some loaves of bread. The tailor has or can make all the clothes he wants, so this particular piece of clothing is not worth a lot for him, while the same thing can be said for the baker and his bread. On the other hand, the baker values the clothing higher than the tailor does, and the tailor values the bread higher than the baker does, so both walk away richer from the exchange than they were previously. Both act in their own selfish interest -- both win out. This is, fundamentally, how wealth is created.
The numeric value of money often confuses people erroneously -- they think that, since one man exchanges, say, 20 units of currency for a loaf of bread that costs 20 units of currency, the buyer and seller walk away after having exchanged things of exactly equal value -- neither win, and neither lose. The notion is, of course, ridiculous; why would anyone go out of his way to exchange something for something else of equal value? They wouldn't; to the buyer, the bread is worth more to him than those 20 units of currency, and for the seller, it is worth less. Values are subjective. Both win out. (Incidentally, this was one of Adam Smith's most fundamental mistakes in "the wealth of nations" when he formulated the labor-theory of value, and Marx copied it from him and built his entire "Das Kapital" upon it. No wonder Marxism fails to explain anything.)