First of all, if you were replying to me, 'manysummits', my name is Mike, not steve !
Now - to your points:
1) Yes, the UN is a human construct - but what a magnificent construct.
Like a big city at night, from far away - you can't help but see the beauty of human striving.
Also, like a big city, on closer inspection you see the dirt and the crime as well - the dark side of the human condition.
But we can't do much about that - humans are light & dark, both, at the same time.
2) I am a believer in action - not words.
True, the UN was set up ostensibly to prevent WW 3 - I don't know if the verdict is in yet on that one - we may just have been lucky - and, as you say, the war on terror indicates that money still rules. But that is also just the way it is these days, and for a long time into our past.
But if you look at what the UN does - you find that mostly it is about people and justice, and about the natural world, the environment, because we truly are inseparable form nature.
You have the world's only scientific and social forum on climate change - ongoing now for decades.
And the IPBES is set to be the next world forum on biodiversity and extinction, which we are causing.
You have UNICEF - for children.
You have the World Health Organization, and on and on - Immigration... the International Atomic Energy Agency...
So if you look at what the UN does - you see much more than the Security Council.
I would like to close by adding a link to something I just read which I think we will see more of - Edward O. Wilson's new idea, outlined in his book "Half-Earth", for setting the goal of half the Earth as a natural preserve - a combination of parks and less protected natural areas, to maintain 80 % of biodiversity - to keep a habitable Earth.
I have read "Half-Earth", and agree with the premise.
But this interview by Mongabay is frankly even better ! The interviewer seems to have really good instincts - and Edward responded !!
I urge all to take a look - it is an extensive piece.
But if this idea gains traction, it will be the UN in large measure - which will end up guiding this initiative, and lending the weight of the IPBES to it.
The UN is a world democracy.