My own guess--- and it is admittedly a guess --- is that he was unaware of the presence of what Pope Francis now calls the "Gay Lobby" --- when there are secret networks of homosexuals in key positions (e.g. rectors of seminaries) who recommend each other, promote each other, and cover up for each other.
Some of these "secretive" operators are deceitful, manipulative, and cunning to such a degree that an honest normal person never even suspects because they cannot fathom it.
I also understand that some complicit Bishops were nominated by Bernardin and Jadot. I call them Bernardin’s Boys and Jadot’s Jots.
I also think that almost all these left-leaning Bishops have been replaced. There are only a couple or so left. Or maybe Hubbard was the last one.