The question arises, are humans inherently good or evil. My answer, Is neither. The both terms are subjective, people behave and react only how the world allows them to be. The same question can be asked of a lion who kills the cubs in the pride he has just taken over.
Nature has a way of penetrating every sphere that it encompasses. Possibly because it lays the fundamentals of them all, maybe not. The world we as humans have constructed for ourselves, this human nature, can be considered a cheat or a modification. But whatever you consider it, it still boils down to and perpetuates the basics laws of the wild.
The economic structure creates the plain for the competition. The competition, age-old, for resources. The resources necessary for life. It also structured in a sort of reciprocal superimposed double-pyramid: the up facing pyramid representing the people, with the greatest number at the bottom and decreasing as the pyramid rises. The inverse pyramid, superimposed on the first, representing the availability of resources.
At the top of the one pyramid the fewest number of people have access to the most resources: Like, the lions of the Serengeti that control more territory than could be considered necessary. So then what happens to the lower levels, well they do well enough to get what they need and yet still want more: The leopard that manages to get what it needs, albeit within the larger territory of its predatory superiors in the middle. At the bottom, the jackals, foxes and other scavenging predators who are at the mercy of those above him. See how the imposition works. 🙂
 Those at the bottom, rely on the efforts of those above them, either passively in cooperation or take them forcibly. Those in the middle have to share, either, again, forcibly or cooperatively. Those at the top? They get to bully the rest of the layers underneath them. Point made, WHAM!!!, but I digressed.
Take the analogy in context. Every one level, can/will do only the good that their situation permits them to be. The dynamics also predicate the resultant moral decision. Humans are inherently survivors. Surviving only requires you to gather the resources you need at any cost, without regard to what level you reside in.
 So, in summation: 1. Humans are neither good nor evil. 2. The duality is subjective. 3. It’s all about survival.
 BOOM!
(Got a bit excited there, I was on a roll =D )