At some point in any discussion of societal justice, the only possible doctrinal defense seems to be That is the way we do things here   Different communities that each recognize the dignity and equality of all citizens will, for example, nevertheless settle on somewhat different provisions for the elderly
So we can see that general principles of justice are never sufficient to determine the details of social policies fixed within a particular state
Although each adhered to its own principles, a democracy and a monarchy each had the same distribution of wealth in its population.