I have a Arsonist/Mason/Cult save and have a lot of issues with people suiciding to win the game.
What happens is that when it seems that the town is going to win, players will suicide so that they do not get converted by the cult and lose. Problem is, when a majority of the town dies in one night due to suicide, the town can actually lose.
I think there should be an option to shut suicide in the settings, specifically for players who decide to use cult saves.
Players who are really into achievements also like to use the suicide option to get them, which I don't think is that much of a bad thing.