You have tens, hundreds of thousands of people in government, and just as many among contractors, who feel totally comfortable writing at the top of the document "internal use only," "official use only," and a million other synonyms, all of which amount to "none of your business" to the public.
One of the principal factors fueling the proliferation of the abuse of secrecy and sensitive but unclassifieds is the administration's adherence to the unitary executive principal. This administration more than any of its predecessors believes that it is its responsibility to collect power onto itself in the executive office when it comes to the conduct of war, foreign policy, the management of agencies and departments, regulations, etc.
There's no faster way or surer way to consolidate power and disenfranchise critics than to operate in secret. So this plays squarely into the promotion of the unitary executive. That's one factor.
