Why Do Stupid Poor People Keep Having Babies

Do intelligent and functional people tend to be more careful about early or accidental pregnancies, using condoms, the pill or just abstaining from sex altogether? There is still the moon the hand and shooting stars. Does this means that they will have fewer child-bearing years compared to less-functional people, who tend to start having unplanned babies sooner? Highly functional people tend to make more money (sorry, that's just a fact) and prefer to have a stable environment for their children. Another issue, that I know to be quite common, is less-functional people, intentionally pop out as many babies as possible as quickly as possible. Sadly it's my understanding that single parents with no income get great welfare/assistance/benefits etc, and that tax returns are just like a second Christmas. These factors all play into dysfunctional people having more poor stupid babies. This may by me sound uncaring or brutal. The short and sweet of it is that a thousand year's ago very few would have then survived. The motivation and ambition of a reasonable functional individual is by far a greater indicator (than their intelligence or education) of whether or not they will be successful as a parent. If the two parents have low intelligence and have a very low learning curve how the therefore can they be effective parents? Except through American jail's and brutal prison's.