[pantaloony]

I don't have a gripe with the term per se but in this case omitting who did it plainly renders the headline clickbait. If one tiny bit of info added to a headline would lose you most of your clicks, you're being deceptive to gain clicks. In this case the info is that the Nazis banned the book, because no one at all familiar with their book-banning criteria would find it surprising that math books were among the ones they banned, and so would shrug and move on without clicking. The implication of the headline is that the banning is novel or surprising or perhaps especially (and most provocatively) due to its content, but it's not.