Most of the girls were near break-down when they were asked to show their memories, fearing the humiliation and shame they would be exposed to. So most of them didn't show but those who did went hysterical. There were only a few but just enough to do the damage.Hermione felt the fear coming, not from Pansy but from her once-considered-family. She saw how Harry was trembling and Ron yet again broke down in tears. Public humiliation was always his worst fear. While guilt, was Harry's.