You should work for NSA, because the alternative to NSA is worse. Totalitarian governments like USSR, East Germany or North Korea will do anything to have a total information control of their population in order to ensure stability. We have a well established history that if they cannot get this information technologically, they will lie, cheat, extort, kidnap, bully or worse, just to get to this information. USA now falls into this category and they will do anything to have full domestic surveillance. If you don't help them achieve this goal technologically, it will have enormous human cost. The alternative of not getting this information is not acceptable to them so they will get it and you can only help to affect how they get it and how many people and lives are harmed in the process.
If you want to avoid the Gulags, the political prisoners, children not getting in universities because sins of their parents, neighbors spying on each other, informers and snitches everywhere, home searches, not being able to trust anyone, being afraid what your kids say in school that gets back to you, feeling helpless and afraid to report crime to police in fear they would instead investigate you. If you want to avoid all those things, you just have to go and help the NSA to get the information electronically, because the alternative is just too awful.