If it had not been for the acquiescence of engineers who took part in the creation of PRISM, XKeyscore, etc. we... well, we would not have PRISM, XKeyscore, etc. Increasingly there is no such thing as an "amoral" position when it comes to a lot of these things -- you're either an entity who willingly chooses profit over principles, or you do something to defeat the evil as you see it (or, at least refuse to take part in it). In this day and age the conscientiousness of man is one of the last remaining defenses to fight the many evils, new or old, mercurial or familiar. It falls on all of us to think of the moral ramifications of our actions, in the workplace and off, and choose carefully and to the extent we comfortably can to see humanity continue prosperously.
I don't mean this to be a thoughtless, idealistic anti-NSA tirade, I'm frankly very okay with folks working on hip new technology that catches the bad guys, I just think your decision framework which is devoid of any ethical considerations is highly, highly dangerous and I wish for the good of us all that it doesn't catch on.