Economist Thomas Piketty says income inequality plays a big part in fueling radical Islamic terrorism that originates in the Middle East. Piketty, famous for his best-selling book Capital in the 21st Century, which argues global inequality has massively widened in recent decades, wrote in French newspaper Le Monde last week that "it's obvious: terrorism feeds on the powder key of Middle Eastern inequality, that we [the West] have largely contributed to creating." (The article was picked up by The Washington Post on Monday.) While Piketty says "we," he points fairly directly to American foreign policy over the last three decades.