[BluffTHIS!]

Not "anything" but "some things". What purpose could be served by the general public and thus our enemies knowing the details of our intelligence operations and practices or our intelligence/defense technologies? Although of course anything can be taken too far, and while certainly there is no need to keep classified what we know our enemies have already discovered, we would simply be hurting our interests and endangering the lives of our troops and intelligence operatives by allowing too much to be known. The Chinese in particular have been shown to have an elaborate spying network in the US targeted at our defense technology, so why should we hurt ourselves and make it easier for them just in the interest of the people knowing about such details?

And bi-partisan congressional oversight by the few congressmen/senators on defense and intelligence panels isn't just for show. Although any opposition party is generally going to give the benefit of the doubt to the defense/intelligence establishment, they can't afford politically to just sign off on anything, and especially not something that is actually illegal.