Why? Humans aren't the only species that shape their environment. Beavers build dams, for instance, with enormous consequences for local ecosystems. Our problem isn't "deviating from nature"—we ARE nature. Our problem is poor stewardship of our resources. The political influence required to enforce some sort of anti-technology mandate could more easily be expended switching to sustainable energy and agriculture.
Anyway, the Georgia Guidestones are just one weirdo's hot takes. They vary from blandly unobjectionable ("avoid petty laws and useless officials"? yeah nobody supports "useless" and "petty" things) to dubious ("rule passion — faith — tradition"? I guess passion's fine, but faith and tradition lead a person in weird directions) to outright eugenicist ("guide reproduction wisely — improving fitness and diversity").
Another beaver comment... I know you didn't explicitly say it, so I will just to clarify in case you meant well. For all the city folk on here who read the beaver dam stuff and infer that beavers are destructive to eco systems, rest assured this is not the case. Consequences for local eco systems? Yes. Positive ones. There is no shortage of information out there about this subject. Sorry to preach, but I happen to live in beaver country and have spent more time in the dwindling forests and wilderness than most people. When people start talking about beavers building dams in this context it sounds so ridiculous.
Another note: The largest beaver dam discovered is about .5 miles in length. Even if it was purely destructive to local eco systems it would hardly compare to human development.
I have beavers in my area too—I'm well aware that dammed lakes are their own rich ecosystems full of niches for other species to thrive in. The comparison was deliberate: There's no reason why humans shaping the environment has to be a bad thing. Obviously the way we're doing it now is bad—I'm not disputing that—but we could simply do it well instead.
Of course, when species are destructive to their environments, that's natural too. Consider the mass extinction caused by cyanobacteria back when they first evolved. It's not "nature" we want, it's biodiversity and healthy ecosystems. Shrinking the human population to 500M might feel "natural" to some people, but it really has little to do with our actual environmental goals.
Anyway, the Georgia Guidestones are just one weirdo's hot takes. They vary from blandly unobjectionable ("avoid petty laws and useless officials"? yeah nobody supports "useless" and "petty" things) to dubious ("rule passion — faith — tradition"? I guess passion's fine, but faith and tradition lead a person in weird directions) to outright eugenicist ("guide reproduction wisely — improving fitness and diversity").