I thought most of our stuff is pretty hardened. Isn't half of it optical by now, anyways? I know alot of the spysats are.
It isn't only a matter of "frying" our own gear.
In addition, there would be more difficulty in monitoring the environment for some period of time.
Besides the political problems and such questions, why would we bother launching a nuke to kill a nuke when we are able simply shoot it down "with a bullet?"