Circular Reasoning

Starting with a false assumption and then building a "house of cards" argument on that single assumption is a common part of the game of Mafia, by sheer virtue of the way in which the game is structured. So many unknown factors, abilities, and allegiances exist in the typical game (and especially in an atypical game, such as a Theme Game or Experimental Game), that each Day is an exercise in sorting out truth from fiction.

It can be difficult at times to tell who is building false arguments based on ignorance (and therefore likely to be ProTown, if somewhat ineffective), and who is building false arguments based on secret knowledge (Scum in possession of the ability to place blame without fear of hitting their teammates). Arguments which seem particularly well-reasoned, or based on hidden assumptions that no one else shares, can sometimes be evidence of scummy behavior. On the other hand, it may be evidence of a Cop with a guilty result who is unwilling to roleclaim yet!