The fall of Adam and Eve seems so innocent compared to the sins that would be committed by their descendents. They broke God's command to not eat fruit from the tree of the knowledge of good and evil. The rest of Genesis tells the story of envy, murder, sexual immorality ( including rape and homosexuality), hatred, deceit, and numerous other sins among the family of Adam and Eve. The saga continues in today's newspaper.
Why did their simple act of disobedience unleash a world of sin? Perhaps part of the answer lies in the insecurity of a broken relationship with God. Would we even be tempted to commit such sins if we were living in the Garden of Eden with an absolutely secure relationship with our Creator? Could our sins be rooted in a deep need for God? Is our "flesh" or "sinful nature" simply (or at least partially) a psychological deficiency that has scarred humanity since the fall?
Could that be why the indwelling of the Holy Spirit is so important? We need the healing presence of God in order to be made whole again.