"If the government is able to keep secrets from us, then we cannot give informed consent on whether their governance is appropriate or not for our nation's citizenry."
This is completely false - and there is not a single state in all of the history of the world wherein this was the case.
Oversight - yes.
All public information - no.
If you have ever worked with a team of more than 5 people, you'd realize that your statement cannot hold true. Do you really think that every email, every correspondence, every bit of government data should be public?
Should Barack Obama have to do everything on a 'live cam' so that every citizen can see his every move and word?
Should the Nuclear Launch codes be 'public information' ???
Of course not!
Government agencies have absolutely no obligation to release any information unless it falls under the auspices of 'freedom of information' (which is a good bit of data) - and then various levels of clearance.
We have other people in government: elected officials, oversight committees, and judiciary, NSA, FBA - to keep an eye on one another.
The information released by Manning was 100% within the bounds of information that the government can keep private.
Private conversations between state officials and diplomats are definitely not something that should be published.
In 40-50 years or so, the US eventually releases pretty much everything, you can read what the US Diplomat to Libya said to Gaddafi if you want then. But not in real time.