I don't think the OP is blaming any social ills on the single mums, he's instead pointing out that this is a symptom of a much larger problem, like the canary i

I don't think the OP is blaming any social ills on the single mums, he's instead pointing out that this is a symptom of a much larger problem, like the canary in a coal mine. Having most of your kids being born to a society's most impoverished and least-educated members is not a recipe for long-term success. Saying this isn't blaming the poor, it's pointing out that there's something seriously wrong with the society, and it's not going to lead to the society improving in the long-term, but probably rather the opposite.