Cale: Special Agent Todd keeps making those sounds, I'm gonna start looking at him.
Walker: You just killed the Secretary of Defense.
Stenz: Well, he wasn't doing a very good job.
President Sawyer: I lost the rocket launcher.
Cale: You lost... How do you lose a rocket launcher?
Walker: You want some cake?
Stenz: No, I don't want cake! I'm a diabetic!
Answer: Knowing is not believing. They might know, but they wouldn't necessarily trust the media. After all it could have been a grand conspiracy to cover up the actual truth from the people.
Alan Keddie
I highly doubt world war 3 would start before these countries did their homework though. It wouldn't take long for them to suss out it was actually terrorists who detonated the bombs and not America.
The_Iceman