Is the information yielded from spying only used for valid national concerns?
The answer is of course you cannot see why you should care, since any duplicity is hidden behind the cloak of good ole patriotic national security there is nothing for you to see. Continue on brave blind soldier.
Please define what you consider a valid national concern.
All of this said - I am wholly opposed to any and all domestic spying without proper legal and constitutional authorization. Further, information learned about America citizens through foreign espionage must never be used and should be destroyed as soon as it is discovered.
Why do you want to benefit the `American' shareholders of American companies vs the `foreign' shareholders of foreign companies?
As far as I can tell many resources both human and otherwise have been expended by the US govt to solidify US corporate grounding. Many of those corporations seek to maximize profit and revenues by offshoring labor and finances. I do not accept this byproduct of excessive lobbying as valid national concerns.
If the nation's sovereignty is a conduit for corporate profits, and immense personal profits by the few monied enough to lobby state actors, then the nation is not very sovereign at all.
I do not follow where you are going with the lobbying/off-shoring concern? I do not have a position at this time, one way or another on the idea of whether a nation controlled by corporate-interests is sovereign or not... I could see arguments for both - I will say such a system is not democratic however - and I strongly opposed to non-representative forms of government.