Hostile journalists and lawmakers have suggested Mr. Trump incited the riot when he told a rally that Republicans need to “fight much harder.” Mr. Trump suggested the crowd walk to the Capitol: “We’re going to cheer on brave senators and congressmen and -women, and we’re probably not going to be cheering so much for some of them. Because you’ll never take back our country with weakness. You have to show strength and you have to be strong.”…

The president didn’t mention violence on Wednesday, much less provoke or incite it. He said, “I know that everyone here will soon be marching over to the Capitol building to peacefully and patriotically make your voices heard.”

District law defines a riot as “a public disturbance . . . which by tumultuous and violent conduct or the threat thereof creates grave danger of damage or injury to property or persons.” When Mr. Trump spoke, there was no “public disturbance,” only a rally. The “disturbance” came later at the Capitol by a small minority who entered the perimeter and broke the law. They should be prosecuted.