The leader of the Roman Catholic Church threw his hat into the ring on the inequality debate this week. “Inequality is the root of social evil,” wrote Pope Francis via Twitter. Meanwhile, the left can’t stop singing the praises of Thomas Piketty’s book on wealth inequality in the developed nations, Capital in the Twenty-First Century. The book has become a rallying point for those calling for higher taxes on the wealthy, greater intervention in the economy, and a greater role of government in our lives. Piketty’s call for a global wealth tax has the American left quivering with excitement.