Cabin in the Woods

In this science fiction film, the question rises about the costs of humanity. In the end, a woman from the facility reveals herself to Dana and Marty, explaining to them what is going on.  These ritualistic sacrifices of groups of five people at a time are consistently performed in order to satisfy the "Ancient Ones," to keep them from destroying the world. If these sacrifices fail, the Ancient Ones will rise and destroy human kind. Marty suggests that if saving humanity can only be achieved by the continuous murder of innocent people, then perhaps humanity should be lost. This satirizes the act of humans killing humans. If people kill each other, then whatever this human way of life is, is not worth living. This ironic situation suggests that if the price for keeping the rest of the world alive is to kill people, then that is not a price worth paying.