Earlier quoted context omitted.
While I wholeheartedly agree with what you're saying for the physical world, the digital world is completely different. In the physical world, the scope of any action is inherently localized. But with digital systems it takes just one person out of seven billion (or even just the right software bug) to create a global scale problem. The Internet is best treated as a source of malicious noise.
The main purpose of government is to protect its citizens from foreign invaders. I don't see any difference here.
There are many differences. I already mentioned locality and scale. Another is that it's possible to make secure software (aka math) that precludes undesirable behavior a priori, whereas such thing is impossible in the real world.