I think in the future eugenics will be mandatory to keep humanity from becoming completely retarded.
In the world humanity has built for themselves (at least in wealthy countries), the principle of natural selection does not work anymore and is also not necessary anymore.

That leads to people being able to reproduce themselves, who would not have done so in nature or rougher conditions.

Just a fucking theory though, I'm not a doctor in genetics or some shit. Humanity might as well adapt itself to the new living conditions and everyone's gonna be fine.
Or we end up like domesticated pigs and become a species of retards.