I would argue yes, in the sense that all of us do (both in our professional and personal lives). The US likes to promote itself as the "good guys", and if they want that reputation, they have to earn it. NSA's activities are in direct conflict with that ideal.

Society only functions properly when people act ethically. We have laws in place for punishing those who harm others in various ways (financially, physically, etc.), as a means to discourage bad behaviour. In theory there's supposed to be international law, but sadly no-one seems to pay much attention to it.