Even if eugenics was a good thing (it isn't), do they really think that with their ideology that dysgenics wouldn't rise as well?
Porky will literally develop conditions to sabotage people on a genetic level until they become human cattle. To do otherwise would be "leaving money on the table". Although it was posted as a joke, this explains why some people push for car dependency even if they know that it will harm people. If we followed that advice beat for beat, the world would be shittier materially even if it 'benefits' the economy: the only thing we are given permission to care about.