I won't pretend to know what's going on here or its implications. So far humanity has lucked out considering our capacity for building some pretty nasty weaponry. We'll probably go through a series of cyberwars before we come to our senses.
I don't blame the NSA for trying to be ready to fight a cyberwar. Other nations probably wouldn't stop their programs even if the US did. Our culture isn't the only one infected with a sense of Manifest Destiny.
Where we might consider drawing the line begins with necessity. Deciding which actions are necessary and which are gratuitous might prove difficult, assuming we even know, which is why I find it hard to fault Snowden for leaking this information.
As fearsome as the NSA sounds, certainly they have some limits. For instance, why don't they just clean out everyone's bank accounts? Might pay their bills for a few days anyway. But why haven't they gone after certain criminals? Many shady operations keep their money in jurisdictions that probably can't compete with our cyberwar capabilities. Maybe these operations enjoy the protection of a powerful entity but probably not all of them do. And probably many operations still use cash and couriers but the US and others seem to have gotten better at tracking movements of people so it's doubtful such tactics will remain viable forever.
Maybe in the end we have to somehow conquer the notion of distrust. Not sure how it can be done except through telepathy and even then the transition to a telepathic society will probably be full of misery.