Earlier quoted context omitted.
How about a middle ground where information private to the government is allowed but there is no NSA or CIA, or at least no intelligence operations beyond keeping an eye on the military movements of other countries? Honest question: What danger would that put us in? My instinct says a moderate amount, but I guess none of us know for sure, which makes it a little scary to imagine.
Honest follow-up question: How much danger would it need to put us in for you to think it's a bad idea? What if what they're not telling us is that FISA collection orders and analysis has kept people from nuking Manhattan a half-dozen times?
The problem with your argument is that it basically allows the government to do anything it wants, and then claim that there is secret information that proves that what they are doing is necessary to save lives.
In my view, there is a need for government secrets. Diplomatic cables need to be secret. The names and locations of informants and spies need to be kept secret (I will not deny the need for such agents). During times of war, the locations and planned movements of troops must be kept secret. On the other hand, the existence of diplomats, the existence of spies, and the existence of the military absolutely should not be kept secret.