I am disgusted to hear of Moore's twisting of a fine , provocative science fiction story. (But if the critics praise a movie or book,I will USUALLY dislike it; now why is that?)
Michael has been grasping a conspiracy theories since the day the planes hit. I think Michael even bought into the "Timothy McVeigh - white guys" hijackers in the first couple of days. He also admits that his world was shattered as he was completing "Columbine" and here this massive attack was carried out without any guns.
I found this on Ray Bradbury's website but no quote from Ray himself:
On censorship, Bradbury is very clear in the F451 dialogues (Montague, Faber, and Beatty) that the main problem was not top-down censorship, but bottom-up laziness.