Has Pope Francis actually specifically condemned the wealthy? His message seems more focused upon helping the poor rather than attacking the rich.
Nevertheless, I will say that it would be a grave mistake for the Church to attempt to align itself more prominently with leftist causes.
Jesus did not say "Blessed are the rich and powerful so that they may indulge themselves on the oppression of the multitudes".
Helping the poor is moral; it spares people from having only such horrible choices as between vice and starvation. It ensures that people can participate fully in an economy instead of hope for salvation from poverty through the appeals of K. Marx and successors.