Exorcism, as practiced by the modern Roman Catholic, Anglican, Episcopal, Lutheran and some Baptist, churches is usually done in a very responsible way. For one thing, it is very rarely done at all.
Unfortunately, in many Pentectostal, Holiness, and -- surprisingly -- Eastern Orthodox churches, it is often considered a "first response" to any problem...and us frequently done without any medical or psychological evaluation.
But don't you think these obviously mentally ill people should get medical help? Our brains are wonderful and complicating things but sometimes things go wrong.