According to mental health professionals, drivng out demons in those who are actually mentally ill can reinforce their delusions.
True in some cases.
What is the point you are trying to make? This is only a forum. Nothing is going to change.
You found a reason to disbelief and you are holding on to it. I and others presented you not with superstitious arguments, but with references to verifiable and respectable sources, showing how there is an effort to collaborate with a branch of science developed in the last century or so.
As for the rest, the Church would rather help someone who thinks is subject to some demonic suggestion than abandon them prey of superstition. This sort of care involves prayer, advice to lead a virtuous life, and direction to visit doctors for treatment - often given to family members as well, if present. It is very, very difficult for someone to receive an actual exorcism. Priests are very skeptical on these matters. I would be more concerned about the availability of superstitious resources that go unnoticed and without any sort of regulation.
Not everything out there is the work of fallen angels, and some could go as far as to argue that all evil is work of human hands, but we know there are spiritual intelligent beings, and we know that some of them are against us. For some religions, these evil spirits are divinities, or the traits of a God who is not All Holy, or even something necessary for the balance of the universe (we hear lots of this latter nonsense nowadays). For us, they are merely disobedient creatures exercising their free will. If they can affect men, it is because men either ignore them or allow them to influence them. Some even seek their help, or seek to serve them.
This is not strange. Among humans, too, there are some powerful people who do not do God’s will, and some men consider them a la pair with divinities. They, too, do evil, and have followers, but no exorcism can drive them away. After all, they are men in need of redemption, not angels awaiting condemnation.
Disbelief in the spiritual world is not a solution to any problem, and is not healthy either, for we are beings both of body and spirit. A healthy balance discerns an equilibrium between both, without focusing too much on either. Priests help bring people towards that healthy equilibrium, not to push them away from it. Errors can always be made. They can also be made by doctors who, confusing laicity with atheism, can attribute everything to the body and ignore our spiritual needs.
Psychosomatics teaches us that some illnesses of the body are not healed (solely) by treating the body. Mental peace is significantly relevant, and part of that peace is found in having a healthy relationship with oneself, with others, and with God. I can’t find a better instruction on this matter than: “love God with your whole heart and your neighbor like yourself, or as much as God loves you”. For that is a recipe for a virtuous life, one that does not chain or enslave, but rather liberates. Religion then - our relationship with God - becomes important in our physical and psychological health, and understanding the existence of a supernatural realm and place it where it fits in the puzzle is important in order to avoid falling down the wrong track, a track of either an act of faith in the nonexistence of something, or one of superstition. For ultimately the true problem is not the devil, but evil. The devil and demons are just creatures that chose to do evil. The real problem is evil.
I am still reading the encyclical on faith written by Pope Francis and Pope Benedict, presented the same day in which a monument was blessed representing the prince of the angels, st. Michael, crushing the prince of the world, Satan, and the hand of Christ Crucified on top of the world with the phrase: “the gates of Hell shall not prevail”. There is a correlation between this event and the encyclical on faith. This Pope has been quite outspoken on the topic of evil in the world, and he is known to be a practical man who has lived a very simple existence, still managing to serve the needy and to lead the Church up to the See of Peter. I post some quotes that show how he relates evil, the devil, and the cross.