If you allow yourself the opportunity to suspend disbelief and be sucked in by the film's ideas, you're in for one hell of a visceral experience.
With this in mind, I did the opposite, and found the film to be even more disturbing. So... I'm gonna try to give my interpretation of the whole story mixing a few stuff from my academic psychological background.
What makes it so rewatchable, is that we get different interpretations through the POV of each…