and it's strange that the Mafia didn't save Vis during the execution, because they could have prolonged his life for another day so that he or someone else could kill a town member, and they should have also intimidated him; maybe then they would have remained with two cops and a Mafia member.
as for me, I made two mistakes. on the second night, I compared the wrong people (although Morne's death helped), because I should have compared Gil (a 100% town member) with someone, not two unknown people. and on the third night, I forgot that the Mafia member kills the investigator. but that's not important, anyway, I got sick and wouldn't have been able to play properly.