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In case you missed it: Last Wednesday, ABC News published a story about the remarkable success of Donald Trump Jr.’s and Eric Trump’s investments in defense companies that have benefited from government contracts since their father returned to the White House. The piece contained several errors. But the network’s handling of the mistakes proved to be a mess.

The article, written by an entry-level desk assistant, led with an announcement from President Trump that Anduril Industries, a defense technology company, had been awarded a multibillion-dollar contract from the federal government to build a shipyard. It also claimed that 1789 Capital, the venture capital firm where Donald Trump Jr.…