" The DID patient should be seen as a whole adult person with the identities sharing responsibility for daily life. Despite patients’ subjective experience of separateness, clinicians must keep in mind that the patient is a single person and generally must hold the whole person (i.e., system of alternate identities) responsible for the behavior of any or all of the constituent identities, even in the presence of amnesia or the sense of lack of control or agency over behavior.
From p8
International Society for the Study of Trauma and Dissociation. (2011). Guidelines for treating dissociative identity disorder in adults, third revision: Summary version. Journal of Trauma & Dissociation, 12, 188–212. "

― James A. Chu