Jurisprudence Polarization is not the problem. Photo illustration by Slate. Photos by Chip Somodevilla/Pool/AFP via Getty Images, SupremeCourt.gov, and Amazon. Sign up for  Executive Dysfunction , a newsletter that highlights one under-the-radar story each week about how Trump is changing the law—or how the law is pushing back. You’ll also receive updates on the latest from Slate’s Jurisprudence team. For two decades, a certain kind of American political thinker has insisted they know the real problem. Authoritarianism, oligarchy, and racism were symptoms rather than causes. The true pathology was partisan  polarization . The sorting of Americans into hostile camps. The collapse of bipartisan comity. We built serious institutions around this diagnosis. Duke opened its Polarization Lab. Princeton launched its Bridging Divides Initiative. No Labels raised tens of millions of dollars. Braver Angels held town halls.…