Let's assume for one terrible moment that there is another successful terrorist attack in the US using Arab nationalists.
And let's assume that Al Quaida was very smart (they are) and recruited Saudi nationals or Iraqi nationals and / or Afghan nationals.
SO WHO THE H*LL ARE YOU GOING TO INVADE NEXT?
Saudi Arabia? What, seize their oil fields and say "naughty, naughty"
Iraq - Oh wait, we're already there and we're getting fired on 50 times a day.
Afghanistan - We're already there and can't find THE ONE MAN who started all this shit on 9/11.
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Screw high tech. If you want to attack soon and effectively, you use materials at hand. Ammonium nitrate and deisel fuel in a rental truck in Times Square (not the financial district) or a stolen yacht in the Port of Miami or Port of New York against the hull of a cruise ship. Or if funds are available from the sale of heroin from the poppy fields of Afghanistan, buy some C4 plastic explosive on the black market.
Terrorists didn't wait for the development of nuclear or biological weapons in Madrid, now, did they?
(:raig