What do you give the man who has everything? A ballroom full of cheering conservative activists found out this week when Elon Musk was presented with a chainsaw by Argentina’s president, Javier Milei, who has used the power tool as a symbol of his push to impose fiscal discipline. Wearing sunglasses, a black Maga baseball cap and a gold necklace, Musk giddily wielded the chainsaw up and down the stage. “This is the chainsaw for bureaucracy!” he declared. Members of the audience shouted: “We love you!” Musk replied: “I love you guys, too!” And he quipped: “I am become meme.”...