What is really naive is to think that nuclear weapons present the greatest danger. In fact, I am amazed that these nations, such as Pakistan, North Korea, India and, perhaps, Iran were and are so intent on the high risk, high cost development of these devices.
Modern societies are so fragile and vulnerable that many means are available to wreck havoc. I really don't want to make a list here for fear of being identified as promoting them, but just think about the substances and facilities in your region which could be used for enormous destruction.
The US was fortunate that, if there really were 19 dedicated young men who perpetrated '911', they chose a relatively harmless method of attack. America's might or homeland were not seriously affected by killing 3,000 secretaries and office workers (sad, of course, as that was). If they had managed to cause even one or two nuke melt-downs, it would have been much worse. A gas storage facility could have taken out Boston.
Nukes are complicated, detectable and problematic. Many other 'weapons' are far more available. What is need to combat this potential is friendliness, not animosity. People rarely attack people they like.
