I don't understand the weird disconnect between HN and the intelligence community. It's almost the perfect job for a 'hacker' type: work with cutting edge technology and thousands of other incredibly intelligent people to try and out-think adversaries to gain access to their resources. You get to build defensive and offensive software to attack computer systems, and actually use it, something that would get you arrested if you did it personally. This was why I loved penetration testing, and an obvious extension of financial security would be working in national security. Yet somehow, these guys are 'evil' now, notwithstanding the IRA and otehrs in the UK, the 9/11 and 7/7 attacks, and so on - those were all perpetrated by _actual_ evil people, who deserved to be investigated and followed and found. And, looking at the leaked documents, there is a huge amount of auditing and checking - don't do this, because it's illegal, don't search for that because it's against the law - not the wild west free-for-all that people seem to imagine.
Anyway, if I could get a clearance, I'm sure I'd love working for GCHQ or SIS in the infosec arena, as would most hackers. The cognitive diasonance is strong in many people!