The well-publicized "caravan" of Central American migrants has arrived in large numbers at our border near Tijuana, Mexico, despite MSNBC's Joe Scarborough insisting the caravan is like a tale of Martians: "They're not comin'." They are attempting to climb over and through walls, and CNN's Jim Acosta had lectured the president saying it would never happen. TV networks, over-reliant on emotional images and under-reliant on facts, are presenting this as they present everything else: as an outrage caused by ... President Trump. A radical group called Pueblo Sin Fronteras organizes hundreds of people who clash violently at the border, and...