The Bishops don't seem to have the courage to stand against popular culture, thus not living up to their roles as shepherds putting their lives on the line to keep the wolves away from their flocks.
I believe that liberals and leftists started many years ago muddying the waters, watering down catechesis so that they could make changes without resistance, since people wouldn't know the difference. Thankfully, folks have been teaching themselves, and young people choosing to come in to the Church are stronger in their Faith.