Then there's political correctness, and their willful refusal to recognize that certain types of families work better than others.
Specifically what types of families are you referring to? I would agree that on average two-parent households work better than single-parent households. I would disagree that straight couples work out better than gay couples, or that having a stay-at-home mother is better for the kids than having both parents work outside the home. There is no evidence that children of gay couples or children of dual-working parents are any worse off than children of straight couples or children of stay-at-home mothers.
