Exorcism is a lie. It's not real at all. It's part of the story like a hollywood movie scrip and you have people trying to explain how it's about psychology and others who take it literally and believe in demons. It's like believing in the star wars story is actually real. People tend to copy and repeat to fit in. Being impressed.
So let it be written so let it be done and teaching in parables. The authors are telling the reader they write stories that are parabolic and the point is to teach not to emulate, but to practice the wisdom learned.
Next thing you know Trump starts talking about liking it when black kids that are like little roaches rub the hairs on his legs to fight a big pool bully named Corn Pop cause he doesn't want his children growing up in a racial jungle.