Now You Hear Me, Now You Don't !
Firstly, some context, if you compare the NSA's reach, in other words, their facility and ability to collect meta-data and to tap into more detailed and more focused surveillance with other nations intel systems then it is like placing bows and arrows next to ICBM's - the NSA out guns all other similar facilities many, many times over. Since, providing protection for American interests not only includes the obvious economic, commercial and financial assets it also covers scientific, military research and development. Moreover, the UK's equivalent to the NSA - GCHQ - offers a helping hand by being connected to the NSA; providing an essential link for European intel into Washington, Why? Because in return the US passes on certain elements of intel to London plus it assists with the ongoing development of GCHQ via the latest software and computer upgrades. This is indeed where the 'special relationship' is truly special. This is all operated under that all incorporating banner of nation-state security.
Hence, ethics and the essential nature of this behaviour is not really considered since justification is always driven by that overriding sense of the need to 'be safe'. But from what? Maybe it is from the very same 'intel agencies' that have developed their own sense of rationality and reasoning that often equates, paradoxically, to a process of constantly being listened to, whilst, ultimately, no one taking account of what we say or mean. This indeed is an extension of post modernity - nothing really matters but the 'hear' and now.
KK