“Social justice” is like “hate crime”; both are unnecessary phrases. Something is either just or unjust; a crime is a crime whether or not hate, love or indifference is the motivation. The extraneous verbiage is simply to empower the thought police-types with usually race-based accusations.
I agree with that statement.
If I understand correctly, the Catholic Church uses the term 'social justice' to mean helping people - the poor, the sick, and so on.