I've generally seen them both associated with parts of the natural order.

Exactly! Chaos would be neither good nor evil. I wasn't equating good/evil with order-chaos, but rather trying to show how the good/evil concept comes from a completely different school of thought than chaos-order or yin-yang concepts.

permetaform was asking why there aren't more stories where good and evil balance out a person. I was saying that it's probably because the concept of good/evil comes from Western ideology. Western ideologies don't believe in balance the way Eastern ideologies do.