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This is the problem with the "Heroes of Might and Magic" mafia games.
Gil (by default, a good player) says something.
Most players immediately have a blissful smile on their faces.
Someone throws out the suggestion that Gil (by default, a good player) is a member of the mafia.
Gil (by default, a good player) says, "You're wrong."
Everyone else nods in unison, because Gil (by default, a good player) always speaks logically and with arguments.
Therefore, the person who suggested that Gil (by default, a good player) is a member of the mafia is the real mafia member and should be executed.
The end.