Jurisprudence Photo illustration by Slate. Photos by Chip Somodevilla/Getty Images and https://www.supremecourt.gov/. 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. While John Lewis was beaten in Selma, while Freedom Riders died registering voters in Mississippi, and while President Lyndon Johnson muscled the Voting Rights Act through Congress, the boy who would grow up to eviscerate it rode bikes through tree-lined streets steps from the shore and was cosseted in private schools in a town built for white residents only. Now that Chief Justice John Roberts has completed his decadeslong effort to undo the most successful civil rights legislation in American history, a simple question remains: Why? Is he a racist?…