An old friend of mine once told me about a guy [who] would ... attempt to murder every other player in the game.Why didn't your friend ever call the police? Murder of one's fellow players, or people for that matter, is a serious crime and, quiet frankly, an affront to humanity.
Apparently that DM wasn't too fond of his other players either, if he allowed that around the table. I imagine the blood would wipe off the mat well enough, but the carpet cleaning bills must have been horrific. And the spilled snackage? My my my.