Another relevant example is birth control itself. There's a huge social movement just about everywhere in the world that opposes it and wishes to prevent women from having it. And unintended pregnancies might fall into the category of "baseball hits on the head", if not quite every week.

Of course the memes advanced against birth control don't explicitly say that "unintended pregnancies are good for you". They say things like "if you don't want to be pregnant, don't have sex" or "not wanting to be pregnant is itself wrong". And there are other hypotheses as to why men, and other women, want women to be pregnant unintentionally or against their will.

But I wonder - could the "baseball bat" effect have contributed to these memes?