You're talking about the Church that developed the "Just War Theory" over the course of millenia, beginning with St. Augustine, 1700 years ago.
Regardless, there is a painfully obvious sense in which war, regardless of its justifiability, always represents a loss for humanity. Does this really require explanation?
“Regardless, there is a painfully obvious sense in which war, regardless of its justifiability, always represents a loss for humanity. Does this really require explanation?”
Only in the sense that cutting out a cancer results in a loss to the body.
He will send a signal to distant nations far away
and whistle to those at the ends of the earth.
They will come racing toward Jerusalem.
They will not get tired or stumble.
They will not stop for rest or sleep.
Not a belt will be loose,
not a sandal strap broken.
Their arrows will be sharp
and their bows ready for battle.
Sparks will fly from their horses’ hooves,
and the wheels of their chariots will spin like a whirlwind.
They will roar like lions,
like the strongest of lions.
Growling, they will pounce on their victims and carry them off,
and no one will be there to rescue them.
They will roar over their victims on that day of destruction
like the roaring of the sea.
If someone looks across the land,
only darkness and distress will be seen;
even the light will be darkened by clouds.