For more than a decade, the Arab Spring has been widely dismissed as a failure, often portrayed as a brief eruption of idealism that collapsed into repression, war and authoritarian restoration.
Riot police force protestors back across the Kasr Al Nile Bridge as they attempt to get into Tahrir Square on January 28, 2011 in downtown Cairo, Egypt. [Peter Macdiarmid/Getty Images] Exactly 15 ...