In Lord of the Flies, I feel it is important to note that one of the reasons order and peace degraded so quickly was the fact that they were school children, and were not yet mature enough to grasp abstract concepts like government and rules. It's also important to remember that the school children banded into tribes quickly, and didn't degrade into savagery within the first two hours of them landing on the island.
I would also like to know your definition of "innately evil". There are cases of frontal lobe disinhibition, where the person afflicted has little or no restraint over what he says or does. If this person degrades into insulting others, is he considered to be "innately evil"? What if the person was perfect before the accident, and was courteous and kind, and according to the general sense of "good" he was the perfect example of, would he still be considered "innately evil". I guess the question is does our actions define this evil, or our thoughts.
Another point I'd like to bring up is the fact that you stated that goodness is only an effect of our upbringing, and if society crumbles we revert to our evil ways. In our current society, we are held to be good to others, and to repress the evil side of us. You are correct in the fact that if those rules that prohibit evil behaviors were removed, then we would quickly swing to express those evil behaviors. But what about the reverse? What if we were constantly held to lie, cheat, and steal by our society. Altruism would be heavily frowned upon, and we would be taught to unconditionally hate and kill every one to help our own survival. If those restriction imposed by that society were to vanish, would not a select few exhibit altruism, if not by human nature, but by simply for the reason of going against society? Would that be an example of innate goodness?
Because I'm rather new to these forums, the quote button is a complete mystery to me >.< Bloodshadow, you raised a question of why would any of us help a homeless man, if it does not benefit us in any way. You said that the only reason was because he was taught by his parents or his upbringing to help others. Then are emotions such as pity, empathy, the ability to connect to others, exist only because society keeps on teaching them? I think no; that those emotions are there TO promote the idea of self-preservation. Which brings me to my next point.
Why does the idea of self-preservation must mean "evil"? What if the reason I helped that homeless person was because I wanted to have the assurance that if I were the homeless person, another would show kindness on me. Is that not self-preservation? Maximizing my own chances of survival by promoting the idea that others will help me if I am in need of that help? Would you consider that to be an "evil" concept or a "good" concept.
Been lurking for quite a while, but this topic piqued my interest... sorry if my ideas aren't coherently organized, it's been a hectic day.