Many of us are military/former military, and/or information "military." You cannot telegraph your moves to the enemy if you wish to succeed, and deception often saves lives. (Tons of examples in various past wars) Embedding journalists in military campaigns is frought with issues for that very reason. The truth needs to be documented, but the "when" it is released is crucial to the success or failure of the mission.
Then there is classified information, need to know, etc. All have their justification. The problem comes when they are misused to cover up embarassments or to hide corruption under the guise of "national security." And of course when used to line pockets. The ultimate power is "who" controls the secrets and how blackmail can be used. Unravelling all of this is a monumental task. Like everyone, I want to know it all and not be lied to, but I can continue to watch and feel we are on the right side of things here.