I guess they are thinking they will weed out unneccessary efforts on their part, spiritually speaking. If the person is "simply" having some type of mental episode that does not require interpreting, etc, I guess maybe they thing they are wasting their time or something? That is ridiculous, though, to ban people. They should use their own discernment to decide what they feel about the person and wether or not they are benefiting from being there, etc. Not everyone with mental illness thinks Jesus is on their toast. We have real encounters also. Sheesh.