This seems to add a piece to the puzzles regarding the comparative weakness of the ties between black men and women worldwide: Public policies promoting marriage may not benefit all children, Cornell social policy expert finds in study. What the study suggests is that white children are affected more by broken homes, black children more by the quality of relationship with the mother. It’s hard to believe the differences are categorical, but different things do go on in different communities and it’s good to be aware of that. In particular, if diversity is real even in fundamental matters like what makes for successful child rearing integration may not be the cure-all that the rhetoric of “inclusion” and “exclusion” suggests.