Keep raising the bar and pretty soon no war is just.We don't win, when it is not a Just War, in the first place.
when it is Just War, then we put all of our power and might in to winning, quickly and deadly.
We tip toe around in wars that never met Just War Theory criteria....because we know we should not be involved in the first place, and are just playing police....thus the tip toeing....don't want to hurt innocents...
In Just War, you KNOW your end, before you begin it and you must know, that the people in the Nation you are warring with, will be better off than they were previous to the war in near every manner....otherwise it is NOT just war....not a war worth fighting.