These other countries are hiding behind the anonymity of their terrorist puppets. We know how is behind most the terrorist groups, who finances them, who gives them intelligence (data, not smarts).
The people behind the terrorist front groups are countries, and we know who they are. We should not be afraid to take the war to them. We could pierce that veil of secrecy if we wanted to, for some reason we don't want to.
Mecca != Hiroshima
I would only advocate this as an extreme last measure. (Actually I would recommend conventional weaponry instead of nukes if the time ever came.)
-Kevin