I would like to see Wally World hit with a lawsuit at around 500 million for a wrongful death lawsuit, because they were very negligent in the preparations for this large a crowd. I think they should put up turnstiles and barriers for people to walk through. Like the theme parks use for the rides. I'm not sure that's the answer, but i know for a fact if there are stuff like that up there wouldn't be any major crowd pushes that could kill people.
From the looks of the pics, from the link above, the crowd was huge, i think i read there were approx 2000 people.
Peace,
Tommy