“Multiple Personality Disorder” (reclassified as “Dissociative Identity Disorder”) doesn’t need to be “cured”. It is not a sign of instability.

Plurality is not a disorder. It’s a phenomenon that has a 24% chance of occurring in any given human’s life. It doesn’t mean plurals are crazy (although some are, most state that their headmates keep them sane), and it doesn’t mean they need to be integrated.