They tried to make you think they were evolved zombies by planting a couple false hints... but when I found out they were just people, I was so disappointed. By that point, the show was already leaning too heavily on interactions between people and drama. At one time they presented this concept that people are more dangerous than zombies, and it was good and interesting... but we get it already. When they were in the prison, you really had a sense of how bad things were. At what point did they decide to stop locking themselves up to go to sleep in case they died for any reason? Every single person you are with is a danger to your own safety.