As I wrote elsewhere, it's hard enough in a vacuum to overthrow a dictatorship and start a free and functional democracy. It's even harder when there are a multitude of foreign powers interfering in your country preventing this from happening. Democracy is failing in the middle east because there are a lot of powerful people and nations who don't want it to succeed, want the region to remain unstable, and want the region to remain within their respective spheres of influence.
And finally, how does anybody know "what they really want" unless you ask the entire country in a free and fair manner? This is the big fallacy behind "the people prefer the lesser evil of dictatorship." You can't say that. You don't have a clue what the people prefer. This is the whole point: if the people want a dictatorship, give them a free, fair, democratic vote and let them choose dictatorship.
