On top of being ragingly stupid and historically inaccurate, it plays into the ignorance of too many conservatives that somehow African-Americans (and other minorities) are unaware of or blase towards the problem of single family households in their own communities. Jesse Jackson has railed against "babies making babies" in speeches to blacks for over 30 years now. Cornell West correctly pointed out that the collapse of the industrial economy during the last few decades hit black families particularly hard as the loss of such relatively low skilled lower middle class to middle class jobs made many black men essentially unmarriagable as they couldn't support a family. Curing this true underlying problem wouldn't exactly be aided by tea party economic policies though, would it?
Of course that goes against the conservative orthodoxy that single mother homes among the poor were directly caused by Great Society programs and the Sexual Revolution immorality of the 60's, and hardly existed at all before then.