On Friday, I drafted an editorial, "George Floyd's Death Shows Need for Change," which mourned the death of George Floyd and called for the judicial application of the Fourteenth Amendment to cases of police brutality. Now, in the wake of days of death, looting, and mayhem perpetrated in cities across the nation, I am impelled to write this followup piece on the parameters for protest, both legal and moral. After the death of Floyd, people of all races and creeds rightfully turned out and exercised their First Amendment right to protest: "Congress shall make no law respecting ... the right of the people peaceably to assemble." Aside from the occasional hard-hitting sign, most of these demonstrations have not been divisive: From sea to sea, the nation is repulsed by the death of Floyd and this disgust crosses party lines. Some anecdotes make this explicit. In York County, South Carolina, the chairmen of the local Republican and Democratic parties protested to...