The fact that there is no evidence confirming the brain disease attribution is, at this point, irrelevant. What we are dealing with here is fashion, politics and money. I view with no surprise that psychiatric training is being systematically disavowed by American medical school graduates. This must give us cause for concern about the state of today's psychiatry. DSM IV is the fabrication upon which psychiatry seeks acceptance by medicine in general.
Insiders know it is more a political than scientific document.
It confines and defines practice, some take it seriously, others more realistically. It is the way to get paid. Diagnostic reliability is easy to attain for research projects. They don't, and can't, because there are no external validating criteria for psychiatric diagnoses. There is neither a blood test nor specific anatomic lesions for any major psychiatric disorder.