Just a quick correction to the OP: We didn't kill Magus Rokyl, we were busy with the last two guards when the two "players" aforementioned logged into the lair and got Magus aggro upon logging in, killed him and were able to trigger Ragefire before we could.
I am not going to comment any further, as I am convinced that the likes of those "players" take their motivation directly out of the frustration they cause other players.
The whole incident motivated me to go out wakeboarding on the lake, to remind myself how unimportant a few pixels are 
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/Slozem