The video When False Flags Don't Fly gives us an interesting view concerning the brutal actions taken by governments in order to persuade and propagandize their own populations while they are still in shock over the violence perpetrated against them.
Click to read one of the most comprehensive and link-rich lists of false flag ops you may wish to find anywhere and watch the video, if you will.
And yes, the Oklahoma City Bombing and both World Trade Center bombings are on the list.
"The Party seeks power entirely for its for its own sake. We are not interested in the good of others; we are interested solely in power. Not wealth or luxury or long life or happiness; only power, pure power. What pure power means you will understand presently. We are different from all oligarchies of the past in that we know what we are doing. All the others, even those who resembled ourselves, were cowards and hypocrites. The German Nazis and the Russian Communists came very close to us in their methods, but they never had the courage to recognize their motives. They pretended, perhaps they even believed, that they had seized power unwillingly and for a limited time, and just round the corner there lay a paradise where human beings would be free and equal. We are not like that, We know that no one ever seizes power with the intention of relinquishing it. One does not establish a dictatorship in order to safeguard a revolution; one makes a revolution in order to establish a dictatorship..."
1984 - George Orwell.