Replacing trust with security
The NSA proved that we cannot trust those in power to show restraint with surveillance. In the 20th century (and due to the absence of things like the cold war or other fundamental threats), terrorism seems to be the catch-all excuse for warrantless, all-encompassing surveillance.
So we need technological tools to re-create privacy. This is a good thing, even if some bad people will use it for bad purposes. To restrict the freedom of all for a small incremental 'common good' is not reasonable: we must be allowed to meet privately and communicate even if some use this freedom for nefarious purpose. It shouldn't matter whether a communication occurs online or in person.
I thoroughly welcome things like dark mail, let's hope it will create a new balance between government and citizens.