Demon Possession mistaken for mental illness. Should we bring back exorcisms ?

If there is a troubled individual in this country, they are diagnosed with a mental health issue. Sometimes these people do great harm to other people. Is it possible they are possessed by a demon or an evil spirit? There are many countries around the world that use exorcism as a treatment for such individuals. Demons need to sacrifice humans to get their souls. The easiest way is to possess a week person and force them to do the killings. This may explain all the mass shootings in our society. We need to bring back exorcism as a treatment. What do you think?