Frankly I think all of this can be summed up in one word: 'globalization.' Unfortunately it doesn't consider the alternatives. The more connected the world is the faster things like disease spread and the more some deleterious event in one place can effect the rest of the world. Hacking isnt a threat, basing your civilization on systems that can break is, that has been true forever and always will be. The alternative is to live under a rock and have high mortality rates to keep the population down so we never leave the neolithic.
Frankly the article cherry picks a couple well known fears that people has and doesn't actually look at where the real weak points are in our current civilization. As others have mentioned, a stick of dynamite in the right place could easily result in further self destructive behavior above and beyond that we have already inflicted upon ourselves as a result of 9/11.