I think everyone should have to watch Mike Judge's movie Idiocracy. The basic concept is two intelligent, capable, model people get married, but put off having kids until they can afford them, which means after college, after getting a good job, after getting established in a career and in a position where they can effectively raise their kids. Meanwhile, redneck morons are popping out kid after kid starting at the age of 14 and those kids breed with other morons and keep repeating the cycle. By the time the smart couple has the one or two kids they can raise properly, the morons are already grandparents. Eventually the entire gene pool becomes saturated with morons because there's a couple dozen of them bred for every smart kid and the country de-evolves into a land of total idiots.
Great movie!
Except it's not a movie, it's a real life story unfolding before us.