1. Rape has technical definitions depending on your individual jurisdiction. I would never trust a therapist to know that definition.
2. Therapists have a bias in favor of themselves even where they factually know different. I think those people have a hard time acknowledging how horrible some, if not all, of them can be and giving things a softer name makes them feel better - not the client.
3. Therapists are no better than anyone else about women and their experiences at the hands of men who have taken a position of authority over those women. They will under play it when it comes to their own or just when it comes to women.

Those are my ideas.