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The city's activity includes voting, not just pointless chatter. Some are quite capable of pretending to be undecided peacekeepers while actually being Mafia, but that's not the main issue right now.
As for the Mafia, it's generally in their best interest to eliminate someone, as long as it's not one of their own. Otherwise, there's a scattering of votes, attempts to defend, and so on. I won't change my vote and believe that it's better to take a risk, especially since so many theories have already been put forward. It's better to execute someone based on evidence and make a mistake while trying to play correctly than to simply believe someone's nonsense and lose due to stupidity.