Cabin in the Woods

What I find odd about this movie is the fact that the inhabitants of the cabin must die. I understand that it is orchestrated and death must be the final outcome, but I wonder who or what their deaths have a purpose for. When the scientist guy cursed at the little Japanese school children who were able to do a sort of exorcism to the ghost, I wondered why he was so upset. I remember him saying something like Japan having a perfect record or some sort, and my guess is that he says that because Japan has been able to conquer their monsters. I would think that being able to conquer things that terrify you and harm you would be a good thing. Those Japanese children placing the ghosts soul into a frog and saying that the ghost will be at peace now, could suggest that the scientists may hate people turning something negative into a positive. I guess it goes against the purpose of trapping people and sending monsters to them to kill them. I can't wait to see if the rest of the film will provide any answers to that.