The presumption is that it was a “good” idea, ... I am not so sure.
Mid-wifed by Wilson, its became an obsession with FDR, so much so that he gave away the store to the Russians, who outsmarted him especially at Yalta in his declining health. As I study more of this, I am tending to think FDR would have been outsmarted if he were in robust health. He was delusional to think if the UK and US could assure the Russians that we had good intentions and they would be secure after the war, they would just settle the geopolitical map according to FDR charismatic wishes.
UN has been a failure overall, and I formed that opinion at age 20 when I paid my own money and toured it. When I walked into the building, I had a positive view of it because of youthful ignorance based on UNICEF. Since then, as I have gained knowledge, my impression formed at age 20 still stands - it is useless.
Solzhenitsyn said it shouldn’t be called the “United Nations”, because the peoples of the world weren’t represented there, but the “United Governments”.
(IE, the peoples of East Europe weren’t really represented by their soviet-client governments).
And DeGaulle noted that the General Assembly will simply attack the West because its factions (islamic, etc.) will outnumber the western countries. Hence, beware of giving it any moral authority.
But we didn’t listen...
Wilson’s obsession with the LON blinded him to the abuse of post-WWI Germany by England and France, laying the seeds for WWII.