The whole game is based around people taking risks and following their own suspicions, but you are looking on the wrong side of things here foa. If the person who dies here tonight is a mafia and the other is somehow revealed to not be one then the citizens will have a lot more basis on who to trust and who not to.

They have taken a better path than blindly voting people who make no posts because remember the mafia are all in one team, they can easily pick citizens off one by one whilst we try in vain to vote for different people. The only way to unite citizens is through trust of each other. Which this is taking a step towards.

Once they are more united and begin to learn who they can trust and who they cannot, that is when they should try and take out the more mysterious players.