If a therapist suggests a patient look at a childhood issue it is because the therapist believes by doing so the patient will find a way to live their adult life more freely.
Consciousness is one of the greatest human capacities, and by moving what is unconscious into consciousness we can shed light in dark corners. We learn more about why we are struggling, and from where this struggle began. This process allows us to become free from our limitations.
Therapists have adults look at their childhood because it works. It's that simple. To the degree that you understand something more deeply and closer to its source, you have more control over it. It is almost never about blaming parents, but instead is about having empathy for the reason the adult feels as he/she does.
