The New Republic is running a list of "a few choice predictions about disaster that never came," which, they say, show that conservative critiques of liberal and/ or progressive policies are always mistaken.

An appropriate response, might be, Megan McArdle's long reflection on unintended consequences. A sample:

[In the 19th century] unwed mothers could not, in most cases, obtain welfare; they were not allowed in public housing (which was supposed to be--and was--a way station for young, struggling families on the way to homeownership, not a permanent abode); they were otherwise discriminated against by social services. The help you could expect from society was a home for wayward girls, in which you would give birth and then put the baby up for adoption. . . .

Now, in the late fifties, a debate began over whether to extend benefits to the unmarried. It was unfair to stigmatise unwed mothers. Why shouldn't they be able to avail themselves of the benefits available to other citizens? The brutal societal prejudice against illegitimacy was old fashioned, bigoted, irrational.

But if you give unmarried mothers money, said the critics, you will get more unmarried mothers.

Ridiculous, said the proponents of the change. Being an unmarried mother is a brutal, thankless task. What kind of idiot would have a baby out of wedlock just because the state was willing to give her paltry welfare benefits?

People do all sorts of idiotic things, said the critics. If you pay for something, you usually get more of it.

C'mon said the activists. That's just silly. I just can't imagine anyone deciding to get pregnant out of wedlock simply because there are welfare benefits available.

Oooops.

Etc., etc., etc.  Just because some predictions have been mistaken, that does not mean they are all mistaken.  I used to expect better from TNR.