But, on the other side of the coin, a small nuke would be the ultimate 'Reichstag Fire'.
A lot of the influence directing the course of this country nowadays is globalist in nature and not necessarily for the benefit of this nation or it's people, the insane policy of the US regarding it's southern border being an example.
If a nuke were to ever be used on US soil, then it would get your average American behind a crusade which would put the resources of many countries under the control of the US military and available to those with influence upon the American government.
For example, Zbigniew Brzezinski, is one of the ultimate insiders in Washington. NSA chief under Carter and stayed on under Reagan to finish implementing FEMA in it's current form.
In the early 1990's, he published a book most Americans have never read, it was called, "The Grand Chessboard: American Primacy and its Geostrategic Imperatives ".
In that book he talked of the absolute need to secure access to the vast oil wealth of the Caspian Basin. To do that would require a pipeline through Afghanistan.
To THAT would probably require American military intervention into Afghanistan. To do that would require the support of the American people.
They would never give their support unless there was an attack upon American soil which could be tied into that area.
Furthermore, a nuke going off on American soil, especially with lots of casualties, could well turn the US into a de-facto dictatorship with a willing nod from a terrified and panicked US public.