If you are evil you can go around killing people because you are bored(if the character would). Mass murderers exist in the real world, so there is no reason not to be one in the game.

Yeah. I can see what you're saying. I wasn't really thinking about a well-thought-out, rped phycopath on a killing rampage, burning and terrorizing the countryside. The idea does have a potential for abuse so by mass murderer, I was thinking more towards some jerk who powerleveled, kills everyone, refuses to rp, claims that he/she is because he went insane a couple years back, kills everyone again, destroys all their stuff, and just tries to make everyone he can kill miserable(annoying even if it is a game). The character is no more than a two-dimensional killer that sticks a sharp object at anything in sight. Now I really like to hear that that kind of behavior is not tolerated and the players/imms try to stop that.

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"Never interrupt your enemy when he is making a mistake."