In psychiatry or at least as taught from psychoanalysis, a 'therapeutic alliance' between patient and doctor is important. The historically eminent Ralph Greenson mentioned in his book on psychoanalysis that 'it was probably for the best that a communist left treatment with him' in circumstances due to WWII. In my hearing of cases in which people acted on a 'duty to warn others' from something said in treatment or wanted to inform others of a crime it has been more a notice that the therapist is having trouble maintaining an alliance than any danger or other value to be achieved. This would seem to be an aspect of the Hasan case.