Along these line, John Keegan in "The Mask of Command" writes about General U. S. Grant: "... he was writing that the war must achieve "the total subjugation of the south" and that the army's duty was "therefore to use every means to weaken the enemy" by destroying not only their armies in the field but their economy at home". Grant's title as "first of the moderns" among generals derives from that gospel of frightfulness. Christian though he was, he persuaded himself that the Just War doctrine of proportionality - restraint of violence within the bounds necessary to make an enemy desist from it - did not apply in a war of principle."
The conflict between Israel and the forces which attack it may be such a "war of principle".