Each one of these things is it's own commentary, that is all. Judge obviously wasn't doing cohesive world building; he was just squeezing together all the commentary he has on why people are hypocritical idiots. All the way down the the eugenics bit.

Since that's where the conversation started, let's go to eugenics first. I would wager the writer has expienced the 'cautious successful people with no kids' trope a million times in real life and in his very successful career. He made it his own when he contrasted it with the Jerry Springer types; which was very culturally dominant at that time. Yes, we look at it today and only see the problematic eugenics message; but I imagine the writers regret when he sees the most intelligent, affectionate, people he knows never being able to do what the dummy's on Springer find all to easy.

The writers world is one on the brink of collapse. All because technology was so advance it was self sustaining, at least for a time. The excess it provided made society's need for education, social structure, and governance evaporate. The time leading up to when Not Sure showed up could have been a cultural revolution of art and space exploration but instead was plagued with reality TV, fart humor, and fast food. All things that were dominating the culture when the writer wrote the script. Taken to the most extreme, focus on making more Gatorade then could ever be consumed would be in line with societies priorities at the time.

Finally, Not Sure becoming president was a simple, funny, way to advance the story. It would be unkind for the author to make all this commentary without giving the audience a polite instruction that could help circumvent our tragic future. That comment being, just feed the plants water. Meaning stop with the idiocy. You don't have to listen to the, "smartest man in the world" because Not Sure was just an ordinary 20th century guy and even he knew that plants need water.