"Help us monitor the communications of private citizens all over the world, even if they use encryption!"
( Need I remind you of this? http://www.wired.com/threatlevel/2012/03/ff_nsadatacenter/ )
Hey it's challenging work! Just like devising new algorithms for helping Wall Street rape the world's economies!
It's exactly what a true hacker wants and needs. Tinker with your favourite programming languages and tools! Go crazy with mathematics! Help us rape the little folks!