Bunkerkind Anni, the "childish" attitude most people usually wear as a facade is only used to fuel more aggressive encounters in-game. Entire wars will be played out on the forums; this is where loved and hated alike will bare their teeth, go all "Yeah we'll see you 8PM tonight ***" and duke it out in-game, only to come on the forum the day after and report the climatic conclusion.
To be upfront, sitting back and enjoying what is already happening in the political scene is riveting and by far beat Hypnerotomachia Poliphili or Dan Brown any day.
Now, to the main topic at hand: I think just merely "killing" someone and "griefing" them should be different terms for different situations. Griefing, at least the way I see it, is when the action of killing someone is done repeatedly, for no other reason than destroying any sense of satisfaction for the victim. In the case that there is no loot to be extracted, no reward for the action, and there is no offender but the sodomizer himself...
Well, even at that point it's very gray in terms of what should be allowed or not.