I truly believe that one thing that causes Southern girls to end up in a chapter they don't want is the fear of hurting someone's feelings. As a Greek advisor, I came up behind several Rho Chis who were trying to pressure girls into returning to parties where they didn't want to be by playing on this. ("Oh c'mon, Amanda, if you don't go back to XYZ, Lori from your hometown will be really, really hurt.")
And before you knew it, the PNM was gently jollied into pledging a group she definitely didn't want, the Greek Office would have a hysterical girl on their hands, and a depledge usually resulted.