Super Murder Mystery is a terrible gamemode.
Nah.
SMM is a wonderful gamemode completely ruined by those who do not actually understand it and thus try to run it in the same way they would a jail rpg. You see, the thing about a Murder Mystery (and with the collective IQ of these people you really can't blame them for missing this) is that it is a loving MYSTERY. Nobody knows who the actual killer is. Trying to enforce any sort of RDM rule here is on par with the actions of handicapped children (oh wait) as even if something that could be legitimately considered as RDM were to happen, everyone else would tend to deal with the problem player as if they were the killer. Circumstance is the point of the game and if you're in the wrong place with the wrong people, you're gonna loving die.
SMM does not in fact need any administration at all apart from the occasional removal of handicaps who spam the chat. Even if some guy's decided his best bet for survival is to go around shooting everyone, it's going to add something. You cannot expect people to get things exactly right in a gamemode that deliberately gives them nothing to go on. I honestly don't know how you people find this so hard to grasp. Between you, you've ruined a good gamemode.
TL;DR - RDM does not exist is Super Murder Mystery. If you find this disturbing,
do not host the gamemode. Your server will be a cage full of only the mildest of souls, all too afraid to make a guess or take a chance lest they get banned.