Soldato
You're right it is.
As for you, me and 99.9% of the population? Well unless they suspect us of wrongdoing and obtain a warrant they should **** off and butt out, it's none of their business and it's not for them to sift through our personal lives/communication.
Personally dont care and to say it was a surprise would be a bit of a lie really - the sheer amount of data they could get and store is so large they could only parse for keywords in real time and then sift back f they needed but frankly if you are stupid enough to be mailling or talking about doing some horrible things across the internet then you deserve to ping on the radar.