There is no such thing as "social justice"; it is a null concept allegedly first-coined by Luigi Taparelli, a Catholic priest, c. 1840. If you try to find a definition of this term, you'll get something like this:
(from the Oxford English Dictionary): "justice in terms of the distribution of wealth, opportunities, and privileges within a society."
(from The UN, 2006): "the fair and equitable distribution of economic, political, and social resources, based on the principles of equality, human rights, and non-discrimination."
Just take a few minutes and digest that. Important questions arise. What are economic resources? Who decides what is fair, and just? Who distributes these things? And more importantly, who produces them?