Looking at the great figures in the Bible, just lots of them had failings, some of them serious ones. So, JS defying God on Polygamy is no surprise. Jacob 2:24 is an example. Anyone here is more expert than I am on Mormon works. For me, God stated clearly that one wife was enough. Then Brigham Young did the same thing.
As to the things in his youth that he spoke of, I am not surprised.
I find it remarkable that despite these fools, so many of the local membership have been so sweet and loving. That is the real miracle of the church.