Nancy McWilliams admits in her book Psychoanalytic Diagnosis: Understanding Personality Structure in the Clinical Process that she can sometimes be a masochist with a depressive personality, which can gear itself up towards rescuing her clients from themselves.
In her section “Therapeutic Implications of the Diagnosis of Obsessive or Compulsive Personality,” she says “… by accepting compulsively self-harming people into analytic treatment unconditionally, the therapist may unwittingly contribute to their fantasies that therapy will operate magically, without their having at some point to exert self-control …”
This is known universally in Therapy World as “rescue fantasies.” Sometimes there is a repeat pattern of trauma in therapy where the obsessive, compulsive self-harming client with abandonment issues regresses and imploringly begs the therapist for extracurricular activities, and the therapist panics and enables the client to regress further by trying to pull them out of their regression with a magical cure, trying to rescue the client by crawling into their fantasies and merging with them. This can cause the client to withdraw and disintegrate or verbally attack the therapist in a sadistic manner due to feelings of overwhelming engulfment. This is where the cure can be worse than the disease.