Myself, I think there's something missing there that is not only the fundamental reason why we humans have such difficulties co-operating but Is also the solution.
That missing piece is the reason why we are able to discuss these things in the first place. It's the life our planet gives us.
We not only need to co-exist with each other but with the life all around us which has become scenery and resource to be taken to many as well as taken for granted, in the linear unsustainable 'take, make, dispose' system, which is prominent in much of the world, and which externalized its true costs. As per Annie Leonard, founder of The Story of Stuff :
"It is a linear system and we live on a finite planet. You cannot run a linear system on a finite planet indefinitely. Too often the environment is seen as one small piece of the economy. But it's not just one little thing. It's what every single thing in life depends on."
Also, we humans currently exist in an Ego model, where we have placed ourselves (via a choice of philosophies adopted long ago) atop of a pyramid of life, instead of being synergistically and symbiotically existent with and amongst life, in an Eco model.
The recognition of what gives us life, that we are simply one amongst many lifeforms, that we need to look after it so it can look after us, that it can be abundant if we do so, has the potential to unite instead of divide. Because it is a common factor to all.
As per the words of Bill Mollison, the founder of Permaculture, who sadly passed away recently yet left the strong legacy of a way forward for us to live With life instead of Against it, "The problem is the solution "
The iissues in our world stem from not recognizing and respecting what gives us all life in the first place. Through recognition of this common denominator, via cooperation and people power, permaculture, symbiosis, synergy, technology, greening businesswith a ruleof 'iif it's not good for the planet and its life then its not good' can lead us to abundancy and away from the poverty, hunger, dis-ease, fear, and war we are so called 'living ' with, yet moving away from.
We CAN do it, together.