As dozens of riot police fired volleys of tear gas towards crowds of angry youths on Bourghiba Avenue this week, the scene was disturbingly reminiscent of what happened on this very avenue two years ago. Even the chanting was the same: "We want the downfall of the regime!" The target of the crowd's anger may be a different government, but many here feel their efforts in 2011, when they succeeded in removing Zine al-Abidine Ben Ali, may have been for nought. Many outsiders, myself included, always believed the Tunisian "Jasmine" uprising had the best chance of succeeding, of building a...