I think we announce them if we get them, if only to shut up much of the rest of the world. Hey, the bottom line is that as we get closer to Baghdad, sooner or later the regime is going to figure out it has nothing left to lose. So we're gonna reach the point you worry about anyway. The key is whether the army will agree to use them, and I think world opinion may matter on that.
It not only won't shut up any of the rest of the world...it won't even change their minds one iota.