I started focusing on computer security as a career back when power control SCADA systems started getting connected to corporate networks and the Internet at the demand of the federal government. The fed.gov demanded opening up the transmission market for competitive access, which led to previously closed, air-gap security, networks being made much more vulnerable through connection to other networks.
That focus on learning how to build "secure" networks took me through companies large and small, the .com bubble, and onto government and military network security. I hope I've learned a few things about security over the years. I do not think that either government or private industry has a monopoly on good security practices, they just go about things in slightly different manners.
While the cyberwar industry makes for entertaining movies and books, they are dependent on the assumptive premise that western civilization will completely collapse after two to three days (or weeks) of life without the Internet, or the television, or power. Cyberwar is not a cold war or something unto itself, it has only proven effective as a prelude, used to stun and confuse a population during an actual, physical, attack.
Computer security, or information assurance, or smart business, is about managing risk. No mere computer attack could wipe out everyone's credit card debt, only a destruction of the debt collection mechanisms, society at large, could wipe out your credit card debt. In the face of catastrophe, people are going to be far more worried about food, survival, and shelter than their mortgage payment.
When lives are at stake, organizations build redundant, physically separated (air gapped) networks to increase security and lower risk. Data is kept in multiple locations, including offline and off grid locations that are not subject to the effects of the risks being guarded against.
If you truly want to believe that civilization will completely collapse in a psychotic fit of withdrawal from the Internet, you really need to unplug and take a vacation somewhere with no Internet. Bonus points for vacationing in a place with no phones or no power.