These people who complain about griefing are the same people who never even get to max level.
With my first MMO, SWG, I went spec ops one day and kept getting owned by Rebel forces (as I was Imperial). I constantly got pissed and never got up to level 90 because I was getting so mad at these "griefers".
It wasn't until I played WoW that I struck back. Griefers polluted the server I was on, but I got to max level because I knew that I'd get them back.
This lowbie killing is not griefing, it's a part of the game. If the dev's start outlawing lowbie killing then this game's PvP will end up at an all time low.
So to those of you who think that lowbie killing is pathetic, how about YOU grow a pair and show these "griefers" who's boss and kill them when you're their level!