According to this article, it can pretty much be summed at that psychiatric disorder is:-
- If the value of applying the concept of disease to psychiatric disorders is measured by quality of rationality as the most appropriate criterion for distinguishing between such disorders and types of behaviour and experience not worthy of psychiatric attention. Then happiness is a:-
a) -behaviour may be described as irrational if it is bizarre and socially unacceptable, reduces the individual's expected utilities, or is not grounded on good (ie logically consistent and acceptable) reasons;
b) -psychiatric disorder are characterised by actions that fail to realise manifest goals, thinking that is illogical and replete with contradictions, beliefs that should be falsified by experience, the inability to give reasons for actions, unintelligible or nonsensical thinking, and a lack of impartiality and fairmindedness.
-irrationality from the above para's of (a) & (b) . That happiness may be demonstrated by the detection of cognitive deficits and distortions of one sort or another. Accordinly to the journal, there is excellent experimental evidence that happy people are irrational in this sense.
Therefore, if Utilitarianism as defined by Mills is a theory based on the principle that "actions are right in proportion as they tend to promote happiness, wrong as they tend to produce the reverse of happiness" , are the worlds policies and majority of the people pretty much derived from and suffer from such psychiatric disorder. xD