Let me repeat Fr. Hardon's words:
Why was there a Judas? One of the reasons the Church gives is to prepare the faithful for apostate bishops. And you see how important it is for bishops to remain faithful to Jesus Christ and his vicar on earth. No heresy has ever succeeded in history unless and until it was backed by a bishop. Pray, pray, pray for bishops!Yes, pray for the bishops. Many among them are Judases and apostates. Let's pray for the discernment to recognize them and warn the faithful against them.