Huh. I have to disagree. Can you really never think of a single time in your whole life, espcially when you were a child, that it actually felt a little bit good to make someone else feel bad? Maybe I should be seeking mental health assistance, but I think that your outlook ignores a part of our humanity that may be ugly but is there nonetheless. This is always my issue with the "unmet needs = misbehavior" paradigm. I think that sometimes the unmet need can just be to experiment with "bad" behavior, and that the most well-rested, comfortable, satiated child in the world is still going to occasionally have to stray to the dark side. It's part of growing up and learning how to define oneself -- both by our good deeds, and our bad.
Anyway, sorry for the totally OT philosophical rant!
ETA: However, I believe this was type of behavior was more a product of our social environment and how we were raised as opposed to an innate attraction to the "human dark side", kwim? Because I've met a lot of children that aren't like this at all. I grew out of all of that manipulation, teasing, backstabbing type of stuff by my mid-teens.