My theory:
Luke learned something during the slaughter of the new jedi temple. Something some books reference Yoda learning during the fall of the old republic. The brighter the light, the darker the shadow. Meaning that the stronger the Jedi are, the stronger the Sith become. Having figured this out, Luke has quit the overall "religion" of the jedi, and turned more into a "grey" jedi to avoid throwing the whole Force out of balance...
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Faster, faster, until the thrill of speed, overcomes the fear of death.
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