Puerto Rico Governor Ricardo Rosselló announced late Wednesday that he’ll resign, effective Aug. 2, amid widespread protests and a text-message imbroglio. The question is whether it even matters given the general corruption of the island’s political class. Think Illinois, 10 times worse.

The immediate cause for the protests was a 900-page report by the Center for Investigative Journalism last week publishing messages between Mr. Rosselló and his aides that denigrate female politicians, gays, fat people and Puerto Ricans in...