I have always been a little wary of the police and intelligence services so take the following with a grain of salt.
Many stories have been exposed over the past few years (especially since the rise of the camera-phone) of questionable behaviour by police officers. In the immediate aftermath of these events, the police will contrive a story, even if the facts don't fit. The intelligence agencies appear to work in the same way, although without the benefit of video evidence it's harder to know what's going on behind closed doors.
Edward Snowden helped to publicise the mass surveillance conducted by several Western governments.
The intelligence services exist with the aim of keeping the country and the people safe. How they achieve that goal is defined by laws but there is generally insufficient oversight, aided by their government masters turning a blind eye.
Whenever they are caught with their hand in the cookie jar, they are told off and politely asked not to do it again. There are never serious repercussions because national security is at stake.
When the documents were leaked by Snowden, many within the security services claimed that the sky was falling. Snowden is a traitor, they said This is treason, they implored. American lives are at risk!
It turns out that there is an official report into the damage caused by the Snowden leaks. Vice News requested a copy of this report and other documents via the Freedom of Information Act.
In response to this request they received back over 100 pages of documents that were almost completely redacted.
If there is such a grave risk to national security then surely some of this report could be made public. Instead we get the same platitudes as always.