IMO, you're theorizing too much.
You don't catch terrorists by announcing your strategies to them. You have to catch them off-guard. Isn't it obvious that it also means keeping the American public in the dark sometimes as well?
Of course it's risky to put blind trust in your government. Everyone knows that, including me. But if you keep forcing the Government to lay it's cards on the table every time it wants to make a move, we will never catch these guys.
During WWII we sacrificed, too. We gave up certain rations, certain materials, we bought war bonds. This is a different type of sacrifice, and IMO, the most important one if we want to get these guys.
You say we have enough tools. How do you know that? Are you saying we should do less than we can because you're worried that someone might read your e-mails? How ridiculous is that? What is the government going to do with your private e-mails? Do you think they'll do something they shouldn't do to you? What's the big problem here?
I think it's more of the idea of it that bothers you, rather than the practical application. You don't know what they may be doing and you find that unacceptable. I don't find it unacceptable. I find it necessary.