Sign up for the Slatest to get the most insightful analysis, criticism, and advice out there, delivered to your inbox daily. Justice Clarence Thomas gave a rare public address on Wednesday that started as a benign celebration of the Declaration of Independence before devolving into a bitter attack on progressivism, steeped with grievance, bad history, and self-regard. In the speech, delivered at the University of Texas at Austin, Thomas blamed progressives for the worst crimes of the 20th century, insisting that “Stalin, Hitler, Mussolini, and Mao” were all “intertwined with the rise of progressivism,” as was “racial segregation,” “eugenics,” and...