Elon Musk has completed a private acquisition of Twitter, promising to unshackle what’s supposed to be a free speech forum from the chains of progressive ruling-class censorship. This is a major victory for free expression—witness all the “wailing and gnashing of teeth” from the corrupt news media and political establishments. It’s important to remember there’s no shortage of temptations to ignore our First Amendment free expression rights and pervert the law into a billy club to banish disturbing speech. Indeed, ever more people demand we outlaw all “hate speech” and “disinformation” in the...