“but any nation with an icbm and tactical nuke could destroy us or any other country with one or two EMPs”
Nonsense.
That’s why the projections are only 10% of population will survive a year after an EMP gets to us. Folks just don’t believe it can happen. A mild solar EMP took down part of the NE grid around 1989 (I think). Both the US have Russia have ran tests on EMP caused by nuclear events. Both Iran and N Korea would love to EMP us and claim they took down the Great Satan.