Okay, single motherhood and children outside of marriage are up too across the board (well not lately, but relative to the 70s and before.... nope welfare is not the biggest factor, maybe not even a factor).
I am not making any excuses.
I have read Walter on this topic plenty of times. He's not quite right. Yes, INDIVIDUALS can do better. SOME are strong enough to overcome no matter what we throw at them. But why should we throw things at them, like you wish to do? Why is it necessary for you to demean them as a group or as individuals? Do you think that helps them in some way? Or is it just about you claiming unearned credit for the achievements of other in your tribe? What's your end goal?
When discussing the group, as those like you pushing identity politics are doing, you have stopped talking about an individual tree and started talking about a forest. In that context those past wrongs WILL skew the numbers. It's not even up for debate and it is not an excuse. It's a fact/phenomenon that has been observed and measured repeatedly.