You evidently failed to read my post: "Anyone who wonders what happens in a society where cohabitation takes the place of marriage need look no further than the nearest ghetto."
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I personally know many couples who live together. None of them are from a ghetto.
Family instability creates a ghetto--that is, a situation in which children end up raising themselves, and quite often, trying to raise their parents as well. People who put their own immediate and selfish desires above the welfare of children end up harming society, whatever their intentions when they decide that traditional values about marriage and family do not apply to them.