First---God is a PERSON, who relates to us and we to God.  Jesus did not tell us that the greatest thing is to OBEY the Divine Law.  Jesus told us that the Commandments are governed by a LOVE RELATIONSHIP [You shall LOVE the Lord, your God and you shall LOVE your neighbor as yourself].   

Vatican II docs., especially 'Guadium et spes,'  begins each of its discussions of five particular areas in part 2.  Each of the five problems treated in part 2 begins with a characteristic present in the modern world.  
1) On the family---begins with marriage and the family n the modern world
2) On the culture--contemporary circumstances----we are in a new age in human history
3) On socioeconomic life---human domination over nature, greater mutual dependence among all, more frequent government intervention characterize our modern age.
4) On political life----there is no way that the election of Donald Trump provides any
   moral certitude.
5) Fostering peace---there's no certitude here, either.