ANGUS MCDOWALL AND TAREK AMARA TEN years ago, a fruit seller set himself ablaze in the central Tunisian town of Sidi Bouzid after an altercation with a policewoman about where he had put his cart. Word of Mohammed Bouazizi's fatal act of defiance quickly spread, sparking nationwide protests that eventually toppled Tunisia's long-serving leader and helped inspire similar uprisings across the region - the so-called "Arab Spring". Huge demonstrations broke out in Egypt and Bahrain, governments fell and civil war engulfed Libya, Syria and Yemen. Tunisians are now free to choose their leaders and can publicly criticise the state. Yet…