Re: the process of de-evolution has begun
The fact that we don't need to have tons of kids for survival is what marks the most recent evolutionary breakthrough. We evolve culturally now, and our children 'inherit' these traits through our upper level interactions with them instead of exclusively through genetic process.
It's not hard to see how the more extreme cases of what you're describing produce 'less fit' offspring. They work in construction yards and factories, they are the warehouse grunts. They are needed to bootstrap the rest of society and provide a foundation for infrastructure. If they ever become useless to society their economic means will certainly be cut off and their numbers will dwindle. The process regulates itself, there's no need for anyone to engineer a selection mechanism.
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