I can understand being optimistic about "Arab Spring" when it was starting, but what makes you think it helps your argument to use it now that we know how disastrously it turned out?

Yes, Tunisia is more democratic that it was before Arab Spring, but Tunisia still only scores at 5.51 on the Economist Intelligence Unit's democracy index (compared to 2.79 at the start of the Spring). (Mexico by comparison scores at 5.25.) More importantly, Tunisia's population (11.7 million Tunisians) is only about 1 or 2 percent of the Arab population, and more Arabs than that have been killed or made homeless by the unrest and the civil wars in Egypt, Yemen and Syria.