It's been established (with evidence) that the goal line is the black line in FRONT of the white line. If the ball hit the white line when it came down (as the photographic evidence shows), then it's a goal. If the AR believes, during the game of play, that it is NOT a goal, then he should have done as you said. The AR didn't. Instead, he ran back to midfield as ARs do when a goal is scored. At the end of the day, you can't argue the facts and the evidence with opinion. If you want to really just blame someone, blame whoever left the player open to take that shot
