[JohnHaugeland]

Businesses also need to protect themselves from burglary, despite that we have the police; fire, despite the fire department; et cetera.

Government is not an abdication of responsibility.

[dredmorbius]

OP specifically addressed "state-sponsored hacking".

Not petty crime and local burglary.

I suspect you'll find that the state does involve itself in organised crime, smuggling, consumer and securities fraud, and the like.