You could see it as a bunch of survival strategy "memes" competing... and some strategies work better in larger groups, others in smaller ones. Typically as humans we have to master strategies for both, in order to do well. Not easy, and not all of us make it.
Or, you could see as I do, a strong evolutionary path to becoming an eusocial species.
Do not forget that certain ant species are
agricultural, exclusively subsisting on farmed fungi. There is ample evidence in the animal kingdom that the kind of tight-knit inwards-turning urban environments humans now build, has lead to eusocialization. (Consider
macrotermes termite nests, and compare to an utopian human self-sustaining arcology.) Will human intelligence counter that? Observation says no; there is evidence that human mean intelligence is actually dropping, although bringing this up is considered racist and offensive (and therefore you won't see a peer reviewed article saying it outright; only old retired profs saying so, and explaining why they think so).
It also brings an interesting interpretation for the
fc term of the
Drake equation: eusocial intelligent beings have no reason to communicate with anything or anyone external.
I don't dare say if I believe there are signs the
r/K selection theory applies to humans too, because that sort of thing gets one completely shut outside the academic world.. but an alien might make some very interesting parallels about r-strategy and communism/socialism, I bet.
There could be literally hundreds if not thousands of eusocial intelligent non-human species all over the Milky Way, none communicating with anyone else, all arguing amongst themselves which words and concepts are to be considered offensive. You know, pondering the
truly important stuff.