Treatment of mental illness is an underrated failure of this religion, in my opinion.
There was a kid who was clearly mentally ill in our congregation. An elder told me in confidence that the elders had been dispatched to this family's house because the kid was hearing voices and the voices were telling him to kill his mother.
Obviously, the elder said, the family was suffering from demonic influence so they prayed with them and helped them go through their belongings to throw away any possessions that could in some way be attached to spiritism, you know, books about witches and the like. As far as I know, the family was never encouraged to seek medical attention.
Thankfully, the kid didn't act out on his impulses (at least not that I'm aware of), but the fact that a complex medical problem like that was addressed by a welder and a ditch-digger is phenomenally irresponsible.