Aight I'm gonna go back and look at Fire and see if I can see why mafia might want to kill him.
I wasn't active for the past few parts of the game, but I can't recall FvI being that active either. This leads me to believe that the possible role cop the mafia has is doing good work so far. I wouldn't put FvI high on my list of investigative suspects though, which leads me to believe that either 1.) The mafia has already exhausted the primary targets they wanted to investigate, or 2.) Regularly "dangerous" players are in a larger amount in this rendition of the mafia.
A powerful role such as FvI might not be a chance kill. The mafia knew who he was, and acted accordingly.
In other news.... What do people think of the latter half of the DekuNut bandwagon?