Larni writes:
The chemical imbalance can be seen as an indicator of illness; rather than a cause.
Well, either way, there's an objective, identifiable sign of an illness, which still is in contradiction to JustinC's argument:
JustinC writes:
it is clear why biological diseases are on surer footing than mental diseases: its not very clear there is a "normal way" for the brain, in particular the neocortex, to operate.