You see the ego buys the illusion that it's the only existing consciousness, when it is not. Far from it.
So movies which tease the ego through plot lines of demonic possession of the body, anything to do with losing the body to another force/entity, and being trapped in the astral world etc, are all fear based scenarios to exploit you for your own ****s and giggles. That is why people love to be creeped out for their entertainment because it really is hitting a nerve point somewhere that they think is detached from reality ie 'safe'. I know, it doesn't really make sense why this should be enjoyable not when you begin perceiving reality beyond the first 3 dimensions and sense the existence of the more subtle realities, the thought/mental/emotional realms and bodies. (Astral)
What it does have issues for is when a person is influenced by this level of programming and then wants to 'break free' - or 'wake up'. It's not just apparent in movies, it's all around us media wise. The terms and insecurities of the ego consciousness is in constant exploitation and jacked about all the time by ourselves, by each other, by other beings who know how ridiculously easy it is to manipulate the ego level of thought. It is a form of manipulation all-round because the media outlets are all wanting us to constantly buy into what they are selling. Be it info, news, music, material goods, lifestyle, celebs. In reality, it doesn't matter if the threat to the ego is scary or not, once the ego is threatened or baited, it tries to defend itself like a little child thug to hold onto its rights, privileges, and everything it has been sold into.
So, much of this is for those who want to surpass the game of ego consciousness and not take along the personal issues/fears with them in their spiritual/astral travels. It is to an extent true that your experiences on the astral level will reflect your mind state, emotional state, and level of consciousness. As the saying goes, as above, as below. That it takes a combination of working on things here as well as facing things there to eliminate and work through your fears legitably. Hope this helps.