No, I will not. Terrorists are like airliner crashes. Sure, the odds are low, but when an airliner goes wrong, it tends to go wrong BADLY. In other words, low incidence, but high consequence. 20 years ago, three guys killed 160+ with a rent-a-truck and homemade ANFO. 14 years ago, some 20 guys killed 3,000 in a single morning. How much worse do you think things will get as the genie of knowledge increasingly escapes its bottle? And note there are increasing numbers of people for whom MAD is a winning scenario.