Luke stressed out moral obligation to God. The Jews refused to recognize their moral obligation to God. They were critical of Christ's actions and teaching. Our modern age rejects its responsibility to God. We recognize that something is terribly wrong, but we refuse to accept personal responsibility.
Man suffers from idiosyncrasies, neuroticism or psychoticism, but it is far from man, to be sinful.
A rejection of personal responsibility causes men to see no need of accepting the gospel message of salvation. When salvation is preached it is like casting pearls before swine which are unable to discern between that which is priceless and that which is worthless. The Jews opposed their moral responsibility to their fellowman. Christ taught that everyone should be treated right, regardless of what his outward appearance or reputation might be. The Pharisees refused to recognize their moral obligation toward all man.