Defense Secretary Pete Hegseth knows that playing a decisive tough guy on television is the way to keep Donald Trump happy, so he did just that while addressing reporters Monday about the U.S. bombing of Iran. He hailed Trump’s supposed decisiveness. He strutted and preened about the bombing death of Iranian Supreme Leader Ayatollah Khamenei. He angrily ridiculed his questioners. He barked out hard-sounding phrases like “War is hell.”But what came out of Hegseth’s mouth was substantively about a...