Precisely. Saddam may be a Clintonesque megalomaniac, but he's no idiot. Do you think he'd be that dumb? Or would he instead just aim a Scud or two?
And how are the Isaeliis supposed to tell what is on the top of that inbound Scud, or even that it is a Scud rather than something with a bit more Ooompf. (The latter is technically possible if you see the early part of the launch trajectory with a suitable sensor.)