OK, so you've elected representatives that you trust. Now what?
A major purpose of having new elections every 4 years (as opposed to life tenure) is to allow the people to periodically re-evaluate their trust decisions. What do you propose as the basis for that trust? Blind faith?
What's being suggested here is that elected representatives ought to be trusted by the public without access to the information necessary to verify that their trust has not been misplaced.
It's not like we're talking about specific information that was leaked. The mere fact that there exists such a broad surveillance program---authorized by Congress, the White House, and the FISC---was classified "top secret" and not scheduled to be declassified until decades later. The legally-enforced lack of accountability to the people for such a massive program undermines the legitimacy of a government that supposedly governs by the consent of the people.
To elect somebody you trust.
This is a republic.