I was referring to this part of his remarks:
There was that great tragedy in Armenia. So many died. I don’t know the figure: more than a million certainly. But where were the great powers of the time? Were they looking elsewhere? Why? Because they were interested in war: their war! And those that died were persons, second class human beings. Then, in the 30s and 40s the tragedy of the Shoah. The great powers had photographs of the railroad lines that took trains to the concentration camps, such as Auschwitz, to kill the Jews, and also Christians, also the Roma, also homosexuals, to kill them there. But tell me, why didn’t they bomb that? Interest!
The Pope was saying that those with military arms had a duty to come to the aid of those in immediate peril of murder, but that they did not do it because they let their other interests take precedence. He was not talking about disarming the powerful. He was talking about the duty that comes with being well-armed. You cannot just use those arms to defend yourself and your own interests, not if other people are being murdered by the tens of thousands.
Weapons don’t make peace. Sometimes weapons are necessary to stop the violent from killing and destroying. Sometimes a Christian can have the duty to take up a weapon to protect others from unjust violence. That should not be confused with peace-making, though. When you’re leveling an opponent, you’re not making peace with him. You’re killing him or disarming him before he kills someone innocent or enslaves the innocent or destroys the livelihood of the innocent. Once you have him disarmed, though, you haven’t actually “made peace” yet. Those are two different things.