fraternities and sororities...what's their real purpose?

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I've been around in societies that embraced its culture. And i've been one of them for quite sometime. I've heared a lot of negatives and positives about a fraternity/sorority. but those who create a fraternity/sorority/society really don't quite get or understand what they are into. They sometimes let neophytes chose for a difficult task or an easy one. The easy one is all about abuse and if you take the difficult one you'll end up beaten. I don't quite get their purpose. They should have tried to pursuade neophytes in some other way. What's your opinion about this?