Mafia 99. The tragedy of the city of Ve-He.

If he can support his position with quotes from the accused player's posts that supposedly expose him, or excerpts from a newspaper, instead of just shouting "I figured it out, he's Mafia! Let's hang him!" Then, of course, he's Mafia, and there's no need to argue – he's either this role or that role, and there can't be anything else, simply because I said so! (Here's an example of a typical reveal.)