We have made it our long-standing policy, made it abundately clear over the years that we will respond in kind. It’s kept our enemies in check since WWII. Though they may field a weapon giving momentary tactical advantage, we will respond with the full might of the American arsenal and erase them from human memory. The Soviets understood this during the Cold War, and refused to risk all, the ultimate destruction of the Motherland, even when Mr. Carter was President.
While we have made said statement, no-one in the entire government of the United States would even think about aiming our full might at a religion. And while some countries do in fact support terrorism, the very nature of Nuclear weapons precludes separating the “peaceful muslims” from the “radicals”.
So, unless the attack on the US could be DIRECTLY tied to a specific government, then such a response will not happen. Period.