everyone is different. everyone has their own ideas on how family life should be. i know some people who think the whole idea of even a monogamy marriages is oppressive to women.and that marriage is a silly idea.
i don't think we should going around pointing the finger at people. not everyone believes that polygamy just like not everyone hates polygamy.
the world doesn't have to submit to one type of lifestyle or thinking.neither does the world have to submit it's self to the same culture.