Fairly sure you've missed out a "don't" in that old adage, Linda...
But anyway. The broader point is what counts as "nothing to hide" anyway? Can any of us ever truly say that? Minor illegal activities, or perhaps legal but potentially career-destroying secrets, all would be laid bare. Perhaps even there are things that you would very much rather had stayed hidden, but forgot about until they were revealed.
As to Naomi's "extraordinary times", granted that can feel true and it may only be intended to be temporary, but there aren't exactly encouraging precedents for that either. Governments tend to be rather less keen on rescinding powers they hold, than they are on giving themselves new ones, so it's naive in the extreme to assume that this set of powers would vanish ten years or so down the line when the threat is judged to have disappeared (or at least reduced sufficiently).
At any rate, while I'm not saying I actually fear a slippery slope to totalitarian state control or something like that, in practice it's better to preserve freedoms and privacy than it is to sacrifice it. For sure, we should fight our enemies to the best of our abilities -- thing is, that our abilities are also constrained by what we're fighting to protect.