Its great this conversation has started, like most I'm unaware of these problems, and its good to get them out in the air, if the fix is renaming a street - then who cares, rename the street.
This is an underrated point; I think your larger message, that cooperation isn't dying, is likely true. I think I have the tendency to focus on the problems that are growing (or continue to exist) without noticing areas where there is progress and my comment was a reflection of that. And I agree that it is good that we have started to have these conversations.
But I also think there is something to be said for the point the OP was making: human systems simply don't function as well at scale. Or stated more precisely: humans are better at being prosocial in smaller groups than they are in bigger groups. There are a lot of reasons why this might be the case (see for example [0], [1], [2], [3]). As we scale our society to be more and more global, I think we are going to need to reckon with this at some point.
[0] Not having enough interactions for tit-for-tat to function as a strategy (https://en.wikipedia.org/wiki/Prisoner%27s_dilemma#The_itera...)
[1] Inability of humans to hit the requirements for a sense of community in very large social networks (https://en.wikipedia.org/wiki/Sense_of_community#Membership)
[2] Not having enough interaction between individuals to encourage reciprocity and cause feelings of guilt (or shame) when an individual is muddying the commons (https://en.wikipedia.org/wiki/Tragedy_of_the_commons)
Maybe there is some limit where there's too many people for that to occur. I feel one of the necessary conditions is the population needs a cohesive belief system (at least in certain areas). For example, if you have a large population that doesn't believe in science but in the invisible hand of god, and a large population that is scientific humanist then I don't think any system will cope with that - there is very little common ground. If everyone is educated and believes in a rational universe then it makes things a lot easier.
* Brisbane's "Boundary St" still exists, name unchanged [0].
* Story from less than 1 hour ago: 4 month-old baby of indigenous women dies while mother is in police custody [1].
* PM calls Australian BLM protests "completely unacceptable"[2], urges people not to attend[3], while "think[ing] to [himself] how wonderful a country Australia is" [4].
* The mounting spread of COVID-19 conspiracies, including the "Wake Up Australia" campaign [5].
* Australia participating in spying on its citizens [6], passing anti-encryption laws [7].
[0] https://www.news.com.au/national/queensland/calls-for-brisba...
[1] https://www.news.com.au/national/northern-territory/fourmont...
[2] https://www.abc.net.au/news/2020-06-11/black-lives-matter-pr...
[3] https://www.abc.net.au/news/2020-06-05/pm-tells-people-not-t...
[4] https://www.sbs.com.au/news/quoting-a-meme-scott-morrison-sa...
[5] https://www.abc.net.au/news/2020-06-12/asio-briefing-warns-f...
[6] https://en.wikipedia.org/wiki/Five_Eyes
[7] https://www.wired.com/story/australia-encryption-law-global-...