We've spent an absurd amount of money "fighting" "terrorism" in the last ten years. This link below details the complete list of alleged and attempted Islamic extremist terrorist attacks on the US since 9/11 (thirty three in all). Some of them are pretty sorry. Terrorists are our grown-up version of the childhood boogeyman. It's time we stop letting ourselves be frightened by our own shadow (and giving up liberty and privacy in the process).
Intelligence agencies work. Airport scanners and citizen vigilance not so much.
PS - F*** you, Michael Chertoff.