“It was all a lie,” Marjorie Taylor Greene recently said about MAGA, capping off an unexpected career turn in which she parted ways with the president and resigned from Congress. A handful of factors precipitated Greene’s about-face, but chiefly she felt betrayed by Donald Trump’s efforts to stymie the release of the so-called Epstein files. Greene was one of four House Republicans who broke with their party in November to compel the Department of Justice to disgorge millions of pages of emails and other material related to Epstein. The fallout has been unremitting. The tranches of files — the largest...