What is going to take to stop the fans from charging on to the court or field?

If a fan or player gets seriously hurt or killed, will schools stop people from charging on the court/field.
So players who have just been in a emotional game are expected to put up with fans in their face and pushing and shoving them. If I was in their place I would clearing a pathway to get to the locker room to get out the danger zone. In my opinion it is shelf defense. Act like you have been there before!