It is in secret because we don't want ya'll motherfuckers knowing how or why we collect intelligence. Is that even a serious question?
It's not clear to me how knowing that the NSA collects metadata of calls and fully records some calls is a threat to national security. It's well known that intelligence services monitor financial transactions to certain Middle Eastern charities and that they monitor message boards affiliated with terrorist groups. That doesn't eliminate said charities as means of funding terrorism, nor does it stop terrorists from using the web. If it did, then the best strategy would be to exaggerate your intelligence gather capabilities, not hide them. ("Oh yeah, we can monitor all posts on private message boards. Better stop using them as effective tools!")
I can see why the "how" would be secret. But nobody's asking for the NSA to release all its tools and make them open source. The "how" also isn't relevant for the public discourse. We don't need to know that Mr. X at the embassy in Tajikistan really isn't doing IT support but taps into some fiber cable that transmits sensitive information.
The "what" and "why," however, is very much relevant in a democracy. There should be a public discourse as to whether a country's intelligence service should be allowed to monitor calls of private citizens in allied foreign countries, or (more relevantly) whether they should be allowed to record data on calls within and in-and-out-of the US. The same goes for accessing email accounts without civilian warrants -- none of the bullshit FISA court that apparently can't find a way to reject a request. A legal apparatus without representation for a defendant isn't a court. Even if you had some permanent lawyers from the ACLU who, sworn to secrecy, would defend the interests of whoever is about to be wiretapped... it'd already be a step up without compromising anything.
The problem with secrecy is that it's extremely convenient for government, because it can hide all its fuck ups. If you recall the wikileaks cables, there is so much mundane shit that somehow got classified as top secret. Secrecy just prevents accountability, and public officials need to be accountable for our system of government to work.
I hope they do catch him and he really does have a dead man switch. Let's see all this shit instead of hearing him or the reporter talk about it.
I do hope he has more information to release. But from what I understand, he gave it all to newspapers that decide what to release and when. This seems more responsible than the leaking of the cables on wikileaks, and I hope it'll be able to sustain momentum.