KANSAS CITY, Mo.—The Las Vegas Raiders were last seen in Kansas City taking a victory lap around Arrowhead Stadium in their team buses, and they decided it was wise to stomp on the Chiefs’ logo at midfield shortly before kickoff Sunday. They probably regret both of those ideas. Patrick Mahomes threw his first two touchdown passes in nearly a month, Clyde Edwards-Helaire added two more scores on the ground, and the Chiefs’ suddenly stingy defense forced five turnovers in rolling to a record-setting 48–9 victory over the Raiders that kept them comfortably atop the AFC West. “You don’t want people coming into your stadium and trying to disrespect things you’ve built,” Mahomes said. “So for us, there was a little more motivation to go against a really good football team that we have a rivalry against.” Derek Gore’s 51-yard TD run with 7:19 left in the fourth quarter allowed Kansas …