The dictators bite the hand that feeds them. Saddam was a US puppet, they supported him in his war against Iran, he turned and look what happened to him.
They more or less funded Al Qaeda, they turned on them so the US tried to destroy every piece of them.
It's simple. It's geopolitical strategy. They use these dictators or extremists for proxy war purposes. When they are done with these dictators, they have outlived their usefulness, or they turn on uncle Sam, the US start publicizing every shit thing they have done, although it was all kept under the rug when they were allies.
When the public sees what these nasty extremists are doing, they beg the government to take action. So they do. They spend a lot of money on military, spy on their citizens, sign laws like the patriot act etc.
God, I hope I don't get the police on my door after this post.