Many years ago, I read a book about simulations of this sort of thing. It took a look longer to read the book than to play this little web game, but you get pretty much the same thing out of the game, so I highly recommend it.
Did you ever wonder where corporate politics come from and why sometimes they can be defused but sometimes the cancer just keeps spreading? That's this.
There are people who are naturally nasty (intrinsic), people who play nasty because they think they have to (environment), and people who are just too nice to nasty people and get hurt (naive). It's important to be able to spot the difference, especially between the first two.