Loved the movie, felt like you could take it a few ways.
There is a line in there when it goes something like "We have to do it this way, you`d hate to see like it was before we were around" spoken by a studio person.
Made me think that the old Gods were not just us, but humanity throughout history.
Dig this, it's like we need these movies and these monsters to "fear" because we as humans need something to be afraid of. And before we had these yearly movies to scare us, people would be afraid of other things and that was very dangerous.
Before there were movies to scare the masses, people used to be scared of witches (Salem witch hunt) and that lead to real deaths. It's also know that people used to dig up graves because they believed in actual living dead because when they did the corpses would have blood on their mouths from Teburculosis, Some folks believed African tribes-people did voodoo and were canibals and the list goes on.
So kinda like the human psyche needs to be afraid, and without the movies we used to get afraid of actual people which lead to dangerous actions. So these movies appease the Old Gods aka human psyche and inclination to embrace fear