Seems like for someone with a history of serious rejection and shame, therapy possibly represents a worst nightmare scenario. Rejection or shaming could happen fairly easily, because the other person is not as invested as they appear or invested at all, and yet is playing a role that evokes feelings of parent or significant other or tribe, and so the rejection might on the surface be sorta trivial since the therapist is just a hired hand, but symbolically could be devastating because of the way deeper parts of the brain receive it? And the therapist is in a position of authority backed by society and institutions, and therefore can spin the meaning to suit their own needs or otherwise push the client around.