At Annunciations, Michael posted a quotation from Carlo Carretto which is _absolutely_necessary_. Go there!
He reminds me of my mother, who used to say:
The Church is my Mother, and I love her. Occasionally, she behaves like a whore, but she is still my mother.
The proof that the Holy Spirit protects the Church is how the Holy Spirit inspired some of our more foul popes to keep their mouths shut. They may have been evil people and horrendous examples, but they never even tried to use their office to proclaim their evils good.