I agree that it doesn't explicitly show someone tilting the scales, but that doesn't mean that eugenics are not an integral part of the premise in a "if we don't do something about this, this is what the world will look like" kind of way.

I still like the movie, but like with any 20+ years old comedies, I can recognise issues with its premise which would be more-or-less unacceptable today. In 2006... not as much. The future is now, old man!