I think you raise a great point. A patient who feels at war within themselves will not achieve peace by killing some part of themselves, and so often the course we take in psychiatry is exactly what you suggest, integrating things rather than trying to kill or remove them. For example, some patients on inpatient units I have worked on find the experience of being physically or chemically restrained to be enjoyable for some reason or another, and have learned how to create situations in which there is sufficient danger to the patient or others that hospital policy requires restraints. The clinical course for these patients involves 1) attempting to limit situations where an escalation to restrain is possible, and 2) attempting to understand and modify the motivations of this behavior, in order to allow the patient to obtain the emotional gratification they get from restraint, from other sources. If this desire for restraint is not acknowledged as part of the problem, however, the patient will continue to behave dangerously in order to be repeatedly restrained.