I won't debate that. But what about several on the same day? That's AQ's tactic. Embassy bombings (2), airplanes (4), London railway (3?).
I have read that the USSR was missing as many as 80 suitcase
nukes.
Kooks with nukes. Not good no matter how many there are.
The suitcase nukes are TINY. Plus, of course, their is no chance that a bunch of savages who live in caves and wear their diapers on their heads have maintained them in working condition.
A coordinated nuclear attack using modern weapons and modern delivery systems could do a lot of damage to the US.
Setting off a so-called "dirty bomb", or a bunch of 1-2kT "suitcase bombs", would just piss us off.