It's a shocking and discouraging lack of judgment, IMO amounting to a virtual societal crime to ignore these factors when deciding what family structure is best.
But, here again, as with all such sociological stats, we have to be careful with the correlation. How much of the one-parent household phenomenon causes poverty, violence, etc. and how much are one-parent households CAUSED BY poverty, violence, etc.? Sounds like both contribute to the other, exacerbating each other in an endless cycle. I would be happier to see each of those factors evaluated separately, especially the violence.