Until the Catholic Church starts giving back the wealth it acquired through centuries of corruption and intrigue, and embraces the simplicity and humility it demands of its members, the Pope can go fly a kite.
The Catholic Church supports over 1000 universities around the world. Almost 6000 hospitals. 9000 orphanages. 13,000 homes for the elderly and disabled. And tens of thousands more institutions in nearly every country in the world.
I think that qualifies as "giving back."