I think that's stretching the definition of "role play". Mafia isn't an RPG, it's a game of social interaction. If it weren't so widespread I might even call it a social experiment.
You have a group of people, you tell them a few of the people are turned against the whole group, and that one will die every night unless you find and kill them first.
Doesn't really sound like an RP, does it? That sounds like a science experiment for how people will handle that kind of situation.
I think you're just being lazy by not sorting them right. Shadoweh has a point, the actual RPGs are getting going to be buried under the list of Mafia games. The forum is called "Rumia's Party Games", not "Rumia's Roleplaying Rave" or "Rumia's Scumhunting Hoedown". We understand that the mods don't exist to cater only to the Mafia players, but sorting them wrong is a disservice to archive binges (RPG OR Mafia) and newbies looking for recent past games to read and learn a game, especially when you already have a convenient list with a bunch of games already.