Why Westerm powers prevent Democracy in Arab world

It may seem inacceptable for many people, but this a reality that western powers firmly block the way of democracy in Arab nations like Jordan, Saudi arabia, Kwait, Egypt, Bahrain … In fact western powers support the absolute Arab dictators to suppress democratic movements.
Why the west never supports democracy in Arab nations? Because they think democracy is against their economical and political interests. But dictator rulers can satisfy western interest. But in the long term they are wrong…