Was Twitter right to delete Donald Trump’s account? Was Simon & Schuster right to drop Josh Hawley’s book? These are open debates that could hide more pressing questions: Who’s next, and why is this happening? Will the next targets in the Great Deplatforming of 2021 be Republican congressmen or pro-Trump radio and television hosts? Or will they be gun owners, pro-lifers, critics of radical gender ideology, and opponents of gay marriage? While we don’t know the answers, there are some safe bets. It won’t simply be publishers and platforms that decline to bake a proverbial MAGA cake. It won’t stop at web servers pulling the plug on social media sites rife with violent threats. And on the why question, we also can have some certainty. The Great Deplatforming isn’t simply about liberal Silicon Valley executives...