A memoir isn’t enough to rehabilitate the careers of today’s disgraced public officials. Any case you make for yourself is damaged by the fact that you’re the one making it. A shrewder tactic is to go full-on Assange, releasing formerly secret documents that you can say prove you were right all along. And so here’s Donald Rumsfeld, doing his best WikiLeaks impression to accompany his new book.

After Iraq and Afghanistan, Abu Ghraib and Guantanamo Bay, there are few rhetorical tactics Rumsfeld can employ to satisfy his hordes of critics. So he’s accompanying his memoir, Known and Unknown, with...