If there are people who feel that God wants them to change the structures of society, that is something between them and their God. We must serve him in whatever way we are called. I am called to help the individual to love each poor person. Not to deal with institutions. I am in no position to judge.
Without out suffering, our work would just be social work, very good and helpful, but it would not be the work of Jesus Christ, not part of the Redemption. All the desolation of the poor people, not only their material poverty, but their spiritual destitution, must be redeemed. And we must share it, for only by being one with them can we redeem them by bringing God into their lives and bringing them to God.