Answer: should such an attack occur we will know where the plutonium for the device originated. That's who we will hold responsible.
Well, I posited that question here, and I am no leftist. In fact, I am not only a Reagan Republican, pro-life Conservative, but I also have run for office as a Republican ... twice. (I received the endorsement of President Bush last time).
Your answer is interesting. So, we have an active nuclear black market. We have scores of "unaccounted" for suitcase nukes, and we are going to just nuke the Russian Federation because of evidence of the "origination" of the device.
That may explain why you do this analysis as a "hobby."
What do we do if the origin of the materials is Oak Ridge? What if it is from a previously unknown origin? What if it is from the Russian Federation, circa 1970? But we don't know how, who, where it came from? We are going to unleash nuclear war and likely total destruction of both Countries, if not the world because the materials in the bomb were produced and once in the possession of a country?
Get serious.
The question of against whom we retaliate is bigger today than ever. First, we need to solve the real question of who. We also have an even bigger problem. Our enemy -- AQ -- is sub-national. Do we hit every country in which their members move about conducting business? If so, do we strike ourselves, the French, the Germans, etc.? Is it the new policy of the U.S. to eliminate civilians with nuclear weapons when we don't even know who hit us.
And, why is the question of proof bigger today than ever before? Because our intelligence on Iraqi WMD's appears to be either faulty, wrong, or incomplete. In any case, many of our own citizens don't have much comfort in our intelligence, let alone our allies that went out on a limb with us.
Now, admittedly, we probably should have checked with the NEIN before going to war, but we can't rewrite that history.
If we are hit with a nuclear strike, radiological bomb, or other WMD in a U.S. city, no one will thirst for blood more than I. But, we are not going to look for Red buttons to push the minute the analysis comes back from the lab and points to the U.S. of materials in the weapon consistent with another Country's production.
Hell, if eliminating AQ and the bad guys was so easy, we would have done it already. President Bush was right post 9/11. This is a different war. It will be fought over many, many years, and it is unlike any war we have known. Frankly, he needs to do a better job of communicating that to the American people, who wrongly see attacks as unconnected acts of terrorism.