I have been in a good few games now where the host forgets to check it and it creates a situation where the mafia can't kill at all and gives the town a clear advantage without the mafia being able to kill at night. This option is irrelivant to the current metagame seeing as balance is designed around different special roles and no one actually plays where the godfather can't kill if they don't have a mafioso to do it for them. It is just an annoying pointless setting that makes idiots ruin games for.