The UN is a tumor on the back of the US.
The United Nations are not and never have been a great help for nations. The Jewish nation got to found a country under UN auspices and since then the UN have done everything in their power to destroy the Jewish state. Other middle-eastern nations, except for the Arabs, didn't get squat from the UN.
For the United Nations the Assyrian nation, the Kurdish nation, the Tamazight nation, the Massalith nation, the Fur nation, the Dinka nation, and the Somali nation means NOTHING.
If you are a nation the UN won't represent you. If you are a country, the UN will help you oppress other nations. The UN are a tool to keep dictators in power. The atomic unit of the United Nations is not the nation but the country.
Countries can be represented by unelected officials. Nations rarely can. But in the UN whoever has power counts. It's not about representing different cultures, it's solely about representing power.