I'm not in love with the term "social justice". I love the idea (as it applies to the church. It won't work as a economic or political model), just not the terminology. What is being given is not justice - its grace.
Since Jesus himself walked the earth the only entity with the power and authority to eliminate hunger and disease and death has been the church. The extent to which those things continue to exist in our world is directly proportionate to our failure as Christians. The only cure for fear and hunger and disease and loneliness is Jesus. As Christians we fail when we deny love and compassion to any one for any reason. If our buildings are not sanctuaries for the dirty and weak and hurting then we are wasting our time and resources. We are called to love.
Where there is hate and envy and judgement in us it has to be purged - not redirected. We have to destroy those things in ourselves no matter what form they take.