Wow... I rushed that last paragraph. Let me try that again...
The other aspect of this film was how the younger villagers dealt with and even confronted their fears. They were unexposed to the real world and knew only what they were taught by the elders (an allegory for how we were taught and how we teach our children). Noah had likely discovered the truth about the village long before we stepped into the story. Perhaps the discovery drove him crazy or perhaps his mental state allowed him to appreciate the irony he lived in. He seemed to relish the idea of "those we do not speak of” attacking the village. And as we learn towards the end, he donned one of the costumes and chased after Ivy. Told from a villager's point of view, this was a monster movie.
Hope that made more sense.
I tend to disagree that Noah knew the truth. It's more plausable that he operated from a simple perspective. But then there was the way he behaved in the woods after finding the costume... Hmmm. Some interresting ideas - I'll have to chew on them a bit.