The reality that everyone is a sinner and has sinned is a basic tenet of Scripture.  In this episode, author Jason Karch suggests that the root or basis of our sin is selfishness and it is found in every person, good or bad.  Thus, when applied to the administration of justice, the 'good people' are not the arbiters of justice for there are no 'good' people.  We all stand guilty before the final judge of the universe.