You appear to believe that all of the injuries were bullet wounds. Probably more than half were rolled ankles or collisions while running, impact with the ground when knocked down in the panic or tripping, trampling, cuts and bruises form scaling the fences and dropping to the ground...lots of ways to get hurt in that environment.
I was assuming the count of injured was those hospitalized. Even if the injured were snowflakes at the concert, I would not expect them to seek medical treatment for cuts and bruises. This was a country music concert, mostly real Americans, so I would not expect a count of minor problems, not when real injuries require medical attention.