I have to; I have no choice. If he can't do it, who can?
Do you mean lead the Church faithfully? Popes can make big mistakes.
That is why the Holy Ghost sends the likes of St. Birgitta of Sweden and St. Catherine of Siena. The Holy Spirit does do it, leads us into all truth throughout the unbroken history of our Catholic faith and teaching, and we must pray and work in humility with the zeal of those two holy women of God. Enough wringing of our hands, praying, weeping, and giving up.
I love the Vicar of Christ, and pray for him fervently, but I'm not going to deny that there is genuine weirdness going on, and I'm not going to be party to his deification which some quarters seem to demand. I have an intuition that God is raising up a whole new generation of St. Birgittas, St. Catherines and St. Vincent Ferrers all around us. We should be praying for them too.