My 'Either/Or' Quandary

After reading Proverbs 10-31 a few times through, I'm finding myself polarizing between the good and the bad, the righteous and the evil, the wise and the fool.  The black and white, either/or parallelism starts to push me toward extremes.  The righteous, wise, upright, good person is clearly the desired posture, however, humans have a sin issue, a bent toward evil, and a rebellious disease buried deep.  As  the Apostle Paul writes in Romans 7, we're a mixed bag of motives, emotions and behaviors.  How do we reconcile this with the antithetical parallelism that dominates Proverbs (Zuck 1995, page 155)?