Tunisians took to the streets this week to celebrate the downfall of the autocrat Zine al-Abidine Ben Ali that unleashed the Arab Spring three years ago.

The contrast between Tunisia and the Arab countries that also rose against their despotic leaders is stark.

As supporters of different political factions mixed peacefully in central Tunis on Tuesday, Egyptians gathered at polling stations to vote on a referendum endorsing the bloody rule of army strongman General Abdel Fatah...