Well observed, in that I had that concern as I wrote that sentence. It's a question of organisms eventually exploiting an available niche, though, and of protohumans implicitly holding a grudge against nature, a grudge that's evident even in the crafting of stone tools. If we needed tools, that means nature didn't give us enough to survive or to achieve our other goals. The difference between late-modern civilization and the prehistoric use of stone tools is one of degree and of the recognition of our yearnings. I think stone age people would have had similar impulses even if they acted on them very differently, with a civilizing mythos (animism) rather than with an armada of technologies.