That is conventional warfare thinking. The goal of terrorism is long term.
Precisely.
People if you think they don't have nukes because they haven't used them yet you are crazy. If YOU had NUKES and other non-conventional means of attack wouldn't you use up everything else first? Of course you would. If I am the terrorist I am going to use up all of other means of attack first. I am going to use my plane attack, shoot off my Anthrax, and whatever else I have AND save the BEST for LAST.
There are a number of good reasons for this. First of all if Washington (or another major city) were to be NUKED, planes crashing into buildings wouldn't have the same psychological/propaganda value. Ditto with Antrhax. Pretty much every things else you use pales in comparison so you better use it first. Second, It would be much much more difficult after having used a NUKE to implement these other attacks (NOT VICE VERSA). The most likely result of a NUKE being detonated on US soil would be the internment of every Arab and Muslim in the country. Third, Osama is looking at the big picture. He has baited us into attacking Afghanistan (which I believe we have to do) in order to JUSTIFY what he is going to do next. Once he has the SYMPATHY of the MAJORITY of MUSLIMS in the world (cause we are bombing Afghan children) they will APPLAUD when he NUKES us.
In short I think it is VERY VERY likely there are alreay nuclear weapons of one form or another already in the country, and they have been here for quite some time. I think it's simply a matter of time before they are used.