@gilgamesh:
Yeah, you can start killing random people in the like if you want. But they won't take kindly to that. Mobs may start throwing rocks at you. Some people will start putting up fliers and the like saying what a horrible person you are. The people will not be happy. :P
You don't have to be a superhero. You can be a supervillian, just like those you're trying to defeat. ^_^