Just shows how ineffective decisions can be when made by amateurs. Asking people to leave early meant that folks with cars in the car park were going to create congestion making it difficult for ambulance to arrive/depart. Asking people to leave early meant putting this poor guy on display like a freak show. Asking people to leave early was not really a sensible request a few minutes from time with the game so exciting. There was only one sensible request, for the people in that area of the stadium to remain in their seats. The wait would only have been for a few minutes.
I think that people were more likely to leave immediately if they didn't know why they were being asked to leave.