One of my new neighbors here in Portland firmly believes that poor people are responsible for the current demise of the US economy. I'd explain her argument in more detail, but since you don't know her, let me tell the story using Harry Potter characters.
The first time that Draco Malfoy meets Ron Weasley, he says that all Weasleys have red hair and more children than they can afford. He's making the same argument my neighbor makes: poor people should not be allowed to have children.
Please note that no poor person has ever made this argument.
The logical flipside to the argument is that only rich people should have children. After all, they can afford it. Oddly enough, though, this doesn't seem to happen. Draco Malfoy is an only child, his father is an only child, and his son is an only child. Considering that they're blood purists who are obsessed with geneaology, they're doing a horrible job of continuing the Malfoy bloodline.
Which brings me to the heart of the matter. When someone says, "I don't think poor people should have children.", they usually mean, "I don't think anyone should have children." Also, they tend to imply, "I dislike poor people." That's true for my neighbor, at least. I wonder if she's related to the Malfoys.