Maybe with your research into social patterns of nature, you can figure out a way around this issue or at least approaches that might work to increase the social transaction depth for humans.

I wonder, though, whether the issue with humans coming together on a global basis for common issues like labor, has less to do with cerebellum size (or individual weakness) and more to do with active interference from governments and corporations to prevent these alliances from forming.

If people are upset and angry about more fringe issues, it is possible to distract them from the impactful issues they may agree on like wage growth, education, healthcare. I believe until people start to realize this tactic and recognize it and counteract it, the average human will continue to lose ground.