The Pope wants to ban all weapons. All weapons, which potentially means almost every physical object. Water is a weapon.
OK, so, the goal isn't practical. But should it at least be aspirational? After all, the Bible says something about
beating swords into plowshares. On the other hand, the Bible also says something about
beating plowshares into swords, and pruning hooks into spears: and "let the weak say, 'I am a warrior.'" For everything, there is a season.
As for the New Testament, Jesus came
not to bring peace but a sword, and urged his disciples to
buy themselves swords if they had to sell their coats.
In terms of Natural Theology, it's hard to think that God is very interested in a world without arms. Animals tend to have natural weapons better than our own for their size; and all animal life, including human beings, can only sustain itself by the consumption of other things that were once alive. If you can know something about God by knowing His works, you would have to reason that God is not opposed to violence. Violence has a purpose in God's scheme.
Banning weapons means that the strong rule over the weak; men over women; the large tribe over the small one. But God favored the David and his sling over Goliath, Judith and her sword over Holofernes, and the Jews over the Egyptians, as well as the other tribes they destroyed in the age of Joshua.
It's a strange sentiment for a Pope to express. It is out of order, as far as I can tell, with reasoned theology whether based on revelation or nature.