Some disciples approached Jesus about the cause of a blind man's suffering They asked, Is this blindness caused by the man's sin or the sin of the parents? Neither, he answered,"but that the works of God may be manifest in him." Jesus didn't need to identify a cause of the blindness to heal the man. He focused instead on the powerful, embracing power of Love.
This is not to say therapy is not helpful; in that case, a person specifically asks for support in exploring their past and beliefs and working toward healing, and a good therapist listens deeply, challenges her own assumptions, and acknowledges complexity, all with the motive of moving people toward a sense of their wholeness.
This is not to say that we don't sometimes have an accurate insight into someone's struggles, but rarely does that person need our unasked for analysis. Begin instead with a sense of Love's presence with that person, speaking to them in just the ways they need to hear, attending to their needs. Often that is all the person needs from us.
Likewise, as noble and necessary as it is to examine ourselves, a thorough understanding of ourselves is not a prerequisite for experiencing Love's healing and transforming power.