2016 GOP frontrunner and billionaire Donald Trump already won his war with the Fox News Channel’s Megyn Kelly. She’s exposed as having a point of view, rather than being a purely impartial arbiter of news. Now he’s just having fun as a larger war between him and the network’s powers-that-be looms. But what Trump has done in a truly special manner is expose that fallacy. It’s not that Trump’s war with Kelly isn’t petty—it is, and it is probably counterproductive to be fighting with a television personality for weeks on end as he’s soaring in the polls. He could be...