The very recent decision of the U.S. Supreme Court not to hear cases from subordinate courts concerning same gender marriage is a move toward one of the fundamental, basic concepts of social sustainability:  How you live your life is not a concern to anyone else as long as it does not interfere with their efforts to support their own survival, existence and sustainability. 
 
It boils down to one person’s standard of morality cannot be forced upon anyone else.  Religious, ethnic, racial and cultural morality is leveled by the ultimate, universal and timeless moral standard of social sustainability.  From Post #11, the three Moral Imperatives of Social Sustainability state the neutral position:  

●  No individual shall diminish or impede the social sustainability of another person, social entity or global entity without moral justification.  
●  No social entity shall diminish or impede the social sustainability of another social entity, individual or global entity without moral justification.
●  No global entity shall diminish or impede the social sustainability of another global entity, social entity or individual without moral justification.  

“Social” relates to more than one individual. “Entity” relates to any permanent or temporary social group and may be organized or unorganized.  For examples, a corporation, governmental agency and the whole government would be considered permanent, organized social entities.  A Tupper Ware® Party and a “Meet Up” cyber group would be considered temporary, unorganized social entities.  “Organized” relates to a temporary or permanent group that has an organizational structure, even if that means a single organizing person as a sole proprietorship. 
 
“Moral Justification” is based on the morality of social sustainability.  Think of “moral justification” as we do in the case of “justifiable homicide.”  In other words, a person is NOT to violate another person’s sustainability, unless there are justifiable reasons to do so.  In a survivalist situation, if you and your family are living on the last food you have in your home and someone breaks into your home to steal it, then you would be justified in violating the survival of the burglar.
  
As you can see from the paragraph beginning with “Social,” the morality of social sustainability extends to all organizations of any size, the same as for individuals.