It seems to be a common attack against abuse victims, to convince them to blame themselves, at least in part.
My wife still suffers from some of that; in spite of reason, she still feels, to some extent, that she is to blame for how her father abused her, and even for his death (from a self-inflicted .357-caliber brain hemorrhage, after if came out what he had been doing to his daughter). At a rational level, she knows that this is all wrong, but still, she cannot escape from it.
I cannot begin to grasp the degree to which the modern pedotrannies fuck with children's minds, in the course of confusing them over whether they are girls or boys. It surely must be a much deeper, more sophisticated, and more destructive form of mindfuckery than what my wife experienced, and even if a child manages to get out of that without actually being convinced that he is of the opposite sex, without having any quasi-medical Frankensteinery done to him, it must still leave some very nasty damage to the mind.