Vimes has the right of it here, I think. They are just people, they are just doing what people do. And even if what people do isn't always as good as it could be, it is far from being as bad as it could be. Mankind is inherently good at a level greater than can be explained by chance alone, p<.05.
Simply writing "p<.05" after a statement doesn't count as evidence for it.
Edit: "Goodness" can be explained from evolutionary game theory: Generous Tit-for-Tat behavior is an excellent survival strategy and often leads to productive (or at least not mutually destructive) cooperation with other individuals practicing Generous Tit-for-Tat. Calling this "goodness" or "evilness" (altruism vs selfishness) is a meaningless value judgment when both describe the same behavior. Really it's neither- people aren't good for the sake of being good, or bad for the sake of being bad but behaving a certain way because it's a good strategy for survival.
Here's the new thread for posting quotes, with the usual rules: