I think it does have a lot to do with the sticter hazing policies. I know at my school the Office of Student Affairs mandates how long pledge can last and what Exactly they consider hazing and it is up to the councils to enforce it.
Every organization has their own way of pledging that is unique to them. Maybe more is going on than what you see. I know we show our pledges sisterhood from day one, but we do expect a lot out of them as well. My housemate is in another sorority and they do the same thing basically.
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