If we as professional and amateur philosophers are to accept psychology as a

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If we as professional and amateur philosophers are to accept psychology as a science (see question 5362 answered by Charles Taliaferro), then what does that make psychiatry? Even if a person fits all the criteria for having a mental disorder according to principles of psychology yet he refuses treatment, why should medical or pseudo-medical psychiatrists intervene so long as that individual decides to refuse to concur with the diagnoses or more importantly refuses to to acknowledge the treatment while accepting the diagnoses? Isn't psychiatry then just a mostly futile exercise in normative ethics to the whim of the patient?