I wonder how much crime would lessen if there were less black/biracial children from broken homes. I don't know the statistics but if I could hazard a guess, I would say that the numbers of biracial children growing up in single parent homes is disproportionately higher than other groups.
I don't want to sound like a bigot but I think Irish, Anglos, Italians and Jews stick together for better or worse and have a greater concept of family.