Why shouldn't poor people have children?

I just read a long blog and a handful of the responses about why gay people shouldn't be allowed to have kids. One responder floated the oft-stated idea that people should all be licensed before being allowed to raise children, and poverty would be one of the discriminating factors against.

Why?

Granted, poor people have a harder time finding adequate medical care, keeping enough food in the house, keeping fuel in the gas tank, hell, even keeping a car to keep fuel in. And yes, socioeconomic status is statistically the greatest factor in a child's life in regards to completion of school and financial success in the future.

But I don't see wealthy people doing much of a great job raising their children, either. Children of wealthy parents are quite as likely to party and blow off school, quite as likely to flaunt a disregard for authority... they are just less likely to be held responsible for their own behavior if their parents move in the same social circles as, say, the presiding judge of the juvenile court in their district.

I actually subscribe to the theory that moral values are more important than material wealth. Some people living in financial poverty also have an appalling poverty of morality, but some people who have lived in wealth for many generations are just as morally degenerate.

There are quite a few life lessons that poor children can learn from morally upright parents that wealthy children won't ever be exposed to, no matter how wonderful thier parents may be. Having a child work for an allowance and learning to save isn't quite the same as working and sacrificing for the family good.