There's a politics to exorcism and in the whole accusation of witchcraft, especially in less developed countries where accusation of witchcraft is a social safe

There's a politics to exorcism and in the whole accusation of witchcraft, especially in less developed countries where accusation of witchcraft is a social safety mechanism to enable parents to eject extra children they can't afford without carrying a burden of guilt for their action. However there is also a real phenomena of trance states and people going into trance and seemingly being "taken over" by an external entity. However this doesn't come from outside the person it springs from what Jung called the "collective unconscious." In the context of a religion like Vodoun the people being "possessed" have a long period of physical and mental preparation such that when they do experience this its in a controlled and ritualized setting. The other thing is because they have syncretized the original Yoruba religion with Catholicism, a catholic vodouist will have far different expectations and assumptions than a normal catholic. For a vodouist they are not being "ridden" by a demon but rather a saint. For the ordinary catholic because every spiritual experience outside the control of the repressive patriarchy is considered evil and demonic any catholic who has a spontaneous experience of an atavistic eruption of the collective unconscious will interpret the experience as evil and negative. Ultimately in the trance state its just an energy that over takes the person, how they interpret and accept or reject the experience is colored by the politics inherent in their religion. The glaring hypocrisy in the catholic church where it gives itself a free hand to abuse the most vulnerable while placing itself as a gatekeeper for all that is moral and good, sets itself up to have more of these kind of atavistic eruptions as the harder the mind tries to ignore these kind of basic contradictions the more the mind is being setup for any spontaneous trance experience to be interpreted as "being taken over by an evil spirit." This creates a feedback loop for the church where the deeper they drive their contradictions the more people have these experiences but because they are mentally trapped in their religion they put themselves at the mercy of the very people driving them into psychosis, when these experiences could be interpreted as harmless and inconsequential in which case people would simply shrug these experiences off.