The details are important. That's why intelligence agencies are so secretive to begin with - unveiling an asset, be it an actual agent or an electronic access point usually has the effect of denying future access to that asset, thereby damaging the US's capability.

Again, you could legitimately argue that that's a good thing in the global scheme of things. You could also argue that sabotaging the US air force is a good thing, on pacifist grounds. Unfortunately, this is where Snowden looks most like a traitor and least like a patriot, because US military officials tend to view the two situations as pretty much the same.