If disclosing information saves even one life then to me it was worth not telling. The government gets accused of lying when it doesnt tell the truth so i think they decid to tell hald the story and that puts them on trial even further. They are in a lose/lose situation.
No, I think the retaliation should be rather stealthy, implied but not proven, much like the support of the terrorists by certain nation-states. WMD, but infectious. Arises in and sweeps through Mideast. If spillover into Russia and China, well thats a shame, seeing as spillover from their corruption, drug running, and organized crime enabled the terrorists to strike us. Collateral damage rather than direct makes it difficult for them to retaliate directly against us. Uses the same WMD that many of these ME countries have been developing, thus killed by their own types of weapons. Oh, and we would have to quarantine our borders, but by doing so in the martial law period that would result from major disruptive nuke hits, you could have plausible deniability of doing so in self-defense, rather than anticipating the bioattack on the ME. Remember Russia's ban on the travel of its govt officials to the US still in effect?
So a stealth attack that everyone knows was our response, yet no one could prove was our response. That's how you attack a threat that has no home to defend.