Why has a Pope, who publicly prayed:
May St. John the Baptist protect Islam...,
been recently canonized as a saint? Wouldn't the devil's advocate have caught that?
Oh, I forgot! It was that same Pope who eliminated the position of devil's advocate, in order to speed up production in his "saint" factory.
The thing is even if the Devil’s Advocate might have caught that, canonizations are infallible when declared by a true pope. The process of canonization has changed throughout the history of the Church, so we can not point to a step in the process as a reason for a specific canonization’s fallibility.