It's not silly, if only because many FREVO's do indeed make the claim that our nation will fall behind in science and technology if evolution is allowed to be questioned. They have even claimed we would go backwards into the dark ages.
Saturn has rings. This knowledge has thus far been completely useless to mankind; but it's still true.
I agree that scientific hypotheses or knowledge shouldn't be discarded simply because they haven't yet proved useful in a practical way.
But again, the point isn't that evolution as a theory shouldn't be considered. The point is that evolution isn't the lynchpin of all modern science as some Evo's try to claim for it.
Possibly not ALL modern science, but biology? Absolutely!