The New York Times reports that last week at a pro-Trump conference, a video showing Trump massacring people with the names of news organizations and left-wing groups superimposed over faces. I will not link to that video, but the scene that it’s using is from Matthew Vaughn’s 2014 movie Kingsman: The Secret Service. The scene has always been bad, and while Vaughn is obviously not responsible for what a Trump follower does with that scene, it brings a troubling light on to the depiction of violence and raises questions about artist responsibility. For those who haven’…