Before the Snowden revelations came along nobody took you seriously if you thought we lived in a world of mass surveillance. Now we all know all too well that we do.
As the scandal unravels the government are clinging to the 'terrorism' fig leaf. They haven't got anything else, no other plausible excuse for what they have been up to. Nobody has completely seen through it yet, or, if they have then they haven't shared with the rest of the world exactly what it is that they are hiding. (There is something else going on, the 'al-qaeda' thing is just a ruse, however nobody really believes that it is a complete, total, utter sham of emptiness. We aren't there yet...)
They are going to have to squirm for a little bit longer before the grand reveal. Exactly who steps up to do this is not known, however, there are plenty of candidates out there, getting bolder by the day. One thing is for certain though, that grand reveal will happen and, when it does, this NSA spying lark will be put into perspective. That perspective will show the spying story so far to be nothing more than an appetizing 'light snack' before the immensely satisfying main course. Compared to what we have got coming the fall of the Berlin Wall was nothing!
Anyone care to guess what the ace is that trumps the government's 'terrorism' card? (There is one!)