U2's Bono is quoted on the Sojourner Community's website:
"I had always been a skeptic of the church of personal peace and prosperity...of righteous people standing in a holy huddle while the world rages outside the stained glass.  But I've learned that there are many people of the cloth who are also in the world - and, from debt cancellation to the fight against AIDS and for human rights, they are on the march."

As long ago as Martin Luther King, Jr. the economic structures of the world were being sharply questioned.  King says:
"...we must ask the question, 'Why are there 40 million poor people in America?'  And when you begin to ask that question, you are raising questions about the economic sysem, about a broader distribution of wealth.  When you ask that question, you begin to question the capitalistic economy.  And I'm simply saying that more and more, we've got to begin to ask questions about the whole society.  We are called upon to help the discouraged beggars in life's marketplace.  But one day we must come to see that an edifice which produces beggars needs restructuring."

There is a cartoon (Pontius' Puddle) in which two chareacters are talking.  One says, "sometimes I'd like to ask God why he allows poverty, famine and injustice when he could do something about it."  The second says, "What's stopping you?"  The first says, "I'm afraid God might ask me the same question."