If all serious mental disorders were so neurobiologically-based, this effect should not occur. It speaks volumes to the benefits of psychological and social factors in mental disorders, and often many medical illnesses as well. Psychological factors simply should not and cannot be ignored. It's not even an adequate response, serving only to muddy the issues and confuse people further. If people with mental disorders want to say they have a neurobiological brain disorder, then people with headaches or stroke victims could very well do the same.
Mental disorders are serious.
And they should be taken seriously and treated seriously. People who suffer from them should be treated with respect and dignity. They should not be told a simplistic and inaccurate explanation for their disorder when the answer is anything but simple. Research on this issue implicates multiple factors for most mental disorders. NAMI should seriously re-examine its agenda and the means it goes about propagating this agenda.