The Insanity Virus
I have the feeling that these things we never can pin down the cause for - like schizophrenia, MS, and psoriasis - I don't think they are caused by any one thing. Perhaps we have been fooled by the almost one-to-one mapping of reason-to-illness that we have seen so far. Schizophrenia, MS, and also psoriasis, are complex systems that manifest from accumlated weaknesses in incredibly complex systems.