That's a very interesting reading! It's been a while since I read it, but IIRC Watts explicitly talks about the matter of intelligence vs consciousness at length and Rorschach's lack of consciousness is essentially proven at some point by the linguist. The distinction is driven home subjectively, personally by the viewpoint character. Your reading adds a rather diabolical twist! I don't think it works though since Rorschach was clearly a tiny part of a much larger, more powerful entity and the humans are clearly doomed. I'm not sure it serves a narrative purpose to have humans be a weak, evil civilization destroyed as a side-effect of a good, strong civilization's actions. I read it as a (hopeless) conflict between non-conscious, infinitely strong aliens vs conscious weak humans and post-humans. I mean it took extreme, heroic effort to damage what is probably a tiny appendage of a much larger civilization/organism, and you lose the emotional resonance if humans are the baddies.