You're missing the point.
The prime reason that is given for destroying a dam that provides energy and water for California is to expose a scenic valley that had been there before.
Period.
My position is that this idea just does not hold water in any rational way of looking at things, and believe me, this isn't the only example out there.
My example about Yosemite is not to advocate damming Yosemite. It was to point out that nature changes scenery too, and that one snapshot or another is not necessarily the "right" version that needs to be protected at all costs.
God, I get back pains here every time I move into analogy or even one tier of abstraction.