Basically
its the concept that the Church must address the social injustices in society, its not the Gospel that we need to be saved out of our sins, but more that we must get restitution for past evils done of us,,,,
Like for example slavery here in USA, would tend to see it as we must right all past wrongs committed against us, and not really the Gospel of Christ, but of social justice now!
21) Then came Peter to him, and said, Lord, how oft shall my brother sin against me, and I forgive him? till seven times?
22) Jesus saith unto him, I say not unto thee, Until seven times: but, Until seventy times seven.
Is not our unmerited mercy and eternal life with the Master, more than we could ever deserve?
Why is that not sufficient for these "Christians"?