It's an analogy of the two human societies we have now! A vast number of sane humans being preyed on by psychopaths that literally see us as livestock to be consumed. And they are empowered by a disaster that destroyed civilization! They live underground in darkness! They hunt humans! They eat humans! They no longer resemble humans! Once you start looking at movies, books, music and all art in terms of the conflict between society and the psychopaths controlling us all you can see this is the most common analogy used in all art. This is the core idea behind: The matrix They Live Dracula Zombies Children of men I am legend Superhero movies The bible The Koran The Talmud The Torah The rock and roll selling your soul story The list goes on and on. It's used so often it's mind blowing.