I don't know if I fully agree that some of the others didn't lose their minds in some way (in every season). They cast it that way for maximum drama. Cam was all anxious and desperate to get his story out, Luke P came off to me like a whiny baby but at least he made the choice to walk on his own, and some of the others involved with the in-fighting probably weren't their best selves in this environment either. Lots of people lose their minds in this environment. That's what brings a lot of the drama, without which there wouldn't be as much intrigue and stuff to talk about.. so in that way, he fulfilled his role and was actually perfect for the show.. just not for Hannah.