Students at Northwestern University, in the Chicago suburbs, woke up on October 25 to face an unexpected allegation. “Northwestern complicit in genocide of Palestinians,” declared the school’s venerable student newspaper, the Daily Northwestern, in a front-page story. The students, however, weren’t really looking at the Daily Northwestern. Instead, they had found the Northwestern Daily, a parody newspaper attacking the school’s stance on Israel’s war on the Gaza Strip. The mock front page featured fake quotes from school officials, accusations of Israeli war crimes, and a fake ad for Birthright Israel — the travel abroad program that sends young American Jews...