I believe that Luke's journey was about becoming a Jedi, because his father used to be one. That's it. Saving Anakin/Vader was something that popped up in the third film. Luke's journey of self discovery was mainly about becoming a Jedi. In words, it seemed to me that Luke was wrapping his identity around being a Jedi . . . not about being Luke Skywalker. He even wrapped Anakin's identity in the same cloak - especially in that line to Palpatine in ROTJ: "I am a Jedi like my father before me." I would have preferred if Luke saw himself being other than a Jedi. But . . . he was still young at the time and had years before reaching true self-discovery.