The field of medical practice and human services that serves those who have, or suspect they have, a mental illness.

Unlike other types of healthcare, it has moral judgements wrapped all over it because it often involves detaining people in institutions because their behavior is different than the general public.

Is this because of an illness or just following the beat of a different drummer?

Example:

You rarely hear of a shooting suspect identified as a "22 year old former diabetic patient"