Why does DR Luther believe Eve is not losing her mind three faces of eve?

In "The Three Faces of Eve," Dr. Luther believes that Eve is not losing her mind because her dissociative identity disorder represents a coping mechanism rather than a descent into madness. He views her multiple personalities as distinct responses to trauma and emotional pain, allowing her to navigate her complex psychological landscape. Dr. Luther emphasizes that these identities serve a purpose in her healing process, rather than indicating a complete breakdown of her mental state. This perspective reinforces the idea that her condition can be understood and treated, rather than seen as a sign of insanity.