Does the Koran help the mentally ill?

How did chaining up the mentally ill and trying to "exercise the demons" out of them by reading the Bible help them? There are always people that inadvertently harm another thinking that they are doing what is best for them. I certainly hope that this was not meant as a crack at Islam, but if it is, Christians have done many similar things in both the past and present that are both just as ludacris and damaging.