“The novelty of our present situation is that modern technology can provide small groups of people with much greater lethality than ever before. We now have to worry that private parties might gain access to weapons that are as destructive as—or possibly even more destructive than—those held by any nation-state. A handful of people, perhaps even a single individual, now have the ability to kill millions or even billions. Indeed, it is perfectly feasible, from a technological standpoint, to kill every man, woman, and child on earth. The gravity of the situation is so extreme that getting the concept across without seeming silly or alarmist is challenging. Just thinking about the subject with any degree of seriousness numbs the mind.”
Source: Microsoft Alum Writes Terrorism Paper – Business Insider