The movie is about smart people not breeding. The smart people stoped existing. It wasn’t a decision to ignore smart people and listen to dumbasses, there were only dumbasses. The obvious problem with the movie is that it’s about eugenics (which doesn’t work that way), but your take changes the plot to be about something that it isn’t.

They found the smartest person in the world and listened to them to fix their problems… Not at all accurate.

Debate and consensus is the point of the UN. However, the US continues to use its veto in the UNSC to block resolutions related to Israel… Consequences are indeed needed, but I wouldn’t be quick to blame the UN as such.