OK you want to know an example, how bout the constant attacks on DOD and DOE systems from china, that are not publicly published all the time. The US infrastructure is a huge vulnerability and if the right person(s) were hired to do the job we could be seeing a sever outage of gas, power, and yes even the internet itself in the US. Lets think now, most companies are moving to web-based apps as a way of providing more for less. Records are mostly stored on servers anymore and not so much in hardcopy form. There are countless things we would need power for and if someone were to take out huge chunks of the power grid the results though may not cause extreme physical harm, unless followed up by another attack, could cause the loss of millions of dollars for companies. I'm not talking take out one source, I am saying multiple sources of power and energy all at the same time. Following that up with any type of physical attack would be even worse. So all they are doing is preparing for a worse case scenario and talking about how they can better harden their networks. Cyberwarfare is real and it is a threat, don't ever think it doesn't exist. Because though you may not recall it the Internet was down for a time in our history as was Google, and other services that society is coming to rely on. And though some of us could get a long without technology, others have it so intwined in their lives, that they just might lose their minds if they lost it.