He’s a messenger not a legislator?
All he is entitled to do is pass along and explain the Divine Revelation that ended with the death of St. John the Apostle, and clarify points of natural law.
He’s like the FedEx guy. He didn’t pack the Deposit of Faith and he’s not allowed to tamper with it.
That doesn’t seem his position, however.
via Pope Francis Has Exceeded His Authority on Death Penalty