So you admit Boniface was a scoundrel...What makes you think God was involved at all in Boniface's proclamation???
Well, YEAH!
I don't get this. We clomp around, talking about the number of popes in Dante's Inferno. The great saint of the Lay Dominicans pretty much got in her pope's face and yelled at him to man up.
And yet some Protestants do an end-zone dance whenever we diss a Pope. What's up with that? It's God in whom we place our confidence. Yes, there have been some awesome and awesomely holy popes. But, starting with Peter himself, many of them have, well let's say, had their moments. "We have this treasure in earthen vessels," and we are well aware of their earthen-ness.
What makes you think God was involved at all in Boniface's proclamation???
Asked and answered: God's promise to the Church.