Vox deputy editor Emmett Rensin was suspended by the media site Friday for encouraging people to riot at Donald Trump rallies. Vox editor-in-chief Ezra Klein said in a statement that Mr. Rensin’s conduct “violated Vox’s standards and Emmett has been suspended as a consequence.” “We at Vox do not take institutional positions on most questions, and we encourage our writers to debate and disagree,” Mr. Klein said. “But direct encouragement of riots crosses a line between expressing a contrary opinion and directly encouraging dangerous, illegal activity.” Mr. Rensin posted a series of tweets Thursday night encouraging people to riot at...