If we treat this list academically, can we find patterns of behavior in "bad parenting"? Is abandonment the great parenting sin in the Lost universe? (Anthony Cook and Locke, Ben denying his love for Alex, Claire abandoning Aaron, Charles abandoning Faraday, Chang abandoning Miles, Diane turning her back on Kate) If so, what does that say about Jin and Sun?
Is there another pattern concerning parents who force children to follow in their footsteps/traditions? (Mr. Paik and Sun, Eloise and Faraday, Christian and Jack, Widmore and Penny, Jacob and his mother). Does this tie back to the idea of cycles.
The best possible world would have the most good and the least evil. Courage is better than no courage. It might be observed, then, that without evil to challenge us, there can be no courage. Since evil brings out the best aspects of humanity, evil is regarded as necessary.