My story is about a group of men who grew up lonely and isolated because of mental or physical conditions that they had which causes members of the opposite sex to never show interest in them and make them feel inadequate. Eventually it gets so bad for them to where they became really depressed, one snaps and drives the others to band together to terrorize society because of their problems and anger, turning them into serial rapist/killers. However, when you form a group like that, how many members could I get away with before it becomes having to suspend too much disbelief? The more that are in the group, that they advertise, the more society will be afraid of them, which is good cause it helps explore the theme I want to convey. Plotwise, the way I like the plot go requires there to be at least 4, since I need them to be in difference places, playing different roles in the story, that are required to each play simultaneously for the plot to work, the way I would like it too. Could there be more though? But when it comes to people like that getting together for such crimes, later on down their roads, how many villains is too not-believable for such a group as that?