> The UN hasn’t prevented nuclear war, it’s accomplished virtually nothing in its long history.
Last "nuclear war" was on 9 August 1945.
UN formed on 24 October 1945.
> Geopolitical reality doesn’t require letting authoritarian regimes chair your human rights committees.
Yes, it does. If they have large militaries and/or economies.
> The UN would be a far more effective and useful body if it took away the right to vote from authoritarian regimes. The idea of providing a UN vote to a dictator or kleptocrat who doesn’t allow a real democracy in their own country is absurd.
No, it wouldn't. The point of the UN is to avoid war, not to spread democracy [1]. The structure of the UN is a consequence of that aim.
[1] https://en.wikipedia.org/wiki/Charter_of_the_United_Nations#...