People are amazingly resourceful, and they will take care of their own kids if forced to. The ones that don't will end up in prison or dead, and thus ends the chain of welfare and criminality.
I recently read an article claiming that diminishing birthrates during the great recession are hindering economic recovery. This is exactly the view that prompts 'economic engineers' to promote childbirth as an impetus to subsidize the various industries of education, health care, and other entitlements. Once these kids are old enough to get jobs, they are either pushed to do so by parents and friends who love them enough to settle for them making the low wages of entry level jobs OR they are pushed into crime to bring in the really big bucks.
Now people are arguing that legalizing drugs would allow that industry to be taxed, but look at how it is taxed already: 1) keeping it illegal inflates the price of the product which means more money changing hands and stimulating GDP 2) keeping it illegal taxes it by tapping drug revenues to pay for legal defense, etc. for those arrested 3) once people have an arrest or conviction on their record, they are kept out of the job market which is as effective as taking their job away and giving it to someone else. In effect, the illegal drug industry converts poor youth into cash cows for fiscally stimulating the larger economy.
Then, considering how dangerous careers in drug commerce and other crime are, it makes sense to promote a culture of eroticism and parental irresponsibility to ensure maximum reproductivity and genetic diversification. If you were running a eugenics program with the intent of maintaining breeding stock, you would try to keep the average age of individuals as low as possible and maximize genetic variation by promoting the maximum number of different combinations of males and females. If you didn't care about the people as human beings, you could promote as much breeding as possible and then allow them to kill each other in prisons or criminality once they had parented a sufficient number of offspring. This is a very sad and cynical perspective, but how much of these practices, which would be ideal in a eugenics program are actually taking place purely as a result of popular culture?
I couldn't go as far as to call it an intentional conspiracy to commit eugenics, but if it isn't then what causes this coincidental similarity to what an ideal eugenics program would look like if it existed?