canceled a prestigious science lecture by the geophysicist Dorian Abbot because it didn’t like his views about diversity, equity and inclusion efforts. Or when Harvard pushed out the evolutionary biologist Carole Hooven because of her insistence on the fundamental realities of sex differences. That’s true, but then why the comparative liberal silence about the Biden administration’s efforts to police speech on social media? Others might argue that Covid misinformation or hate speech should be subject to different rules from mundane political speech. A very fair point — and all the more reason for liberals to stick by liberal principles when it comes to their own side’s self-appointed censors.