The problem is, the purpose of a game (for me), is to do things that I can't/won't do in real life. To me, offending other people or making them unhappy is unethical and I have no interest in doing so. But doing it to the computer is a whole other matter, which is why single player appeals to me a lot more than multiplayer.
I always wanted a game where you could express yourself as inner and outer, e.g., you are really cruel, but you are hiding it and you are being nice to people...
And I have found MMO's being empty, boring, repetitive. At least, that goes to Lineage.
Also, doing that to computers is one thing, doing that to humans is kind of not interesting.