why anyone would go to a counselor or therapist as opposed to a priest I will never know. They have done more to damage the fabric of our society than divorce has, because they are the ones who live in la la land where you can create a new family or marriage on your own steam whether God likes it or not.
Perhaps because the person is mentally ill and needs the resources of a trained mental health professional? It sounds as though you equate common, everyday mood or behavioral difficulties with mental illness. It's actually a very different thing.
Priests are not trained to deal with mental illness and are specifically directed to refer individuals in need of intervention for professional services (sometimes to Catholic Family and Child Services or to a psychiatric clinic if more serious). Not more than a week ago I read an article -- from Catholic News Service, possibly -- in which a point was made that priests were not to make the confessional into a psychotherapy booth.