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I think what most people misunderstand, is that a single nuke (which is entirely possible) anywhere in the world, particularly in the USA would shut down EVERYTHING. Air, global shipping, financial markets, commerce.
I am old enough to remember the LA riots of '92, where with a police infraction led to anarchy. Can you imagine what a nuke attack would do? It would turn us against ourselves.....
Suskind posits that the matierial could be bought for 10-20 million dollars. There's lots of people who could come up with that.