Donald Trump blocked CNN and the New York Times from attending a White House “gaggle” Friday. A gaggle is a variation on a scrum, reporters gathered in a gang to hear from a politician or someone else who has something to say. He shouldn’t have done it. This is not because democracy will live or die because of it. But kicking out reporters you don’t like is petty and, in the end, self-defeating. It does not, as some claim, stop anyone from questioning Trump’s message.