So as long as the other side started the war we're bound by no moral limits in our response? That's an interesting point of view considering world events the last 20 years or so.
“No battle plan ever survives first contact with the enemy” Helmuth von Moltke.
He might just as well have said no war plan.
I doubt Hitler envisioned the retribution his war of conquest would impose upon the German people.
It's all nice to sit in your armchair discussing the moral limits to
total war 70 years after it happened.
I think had you been a Londoner during the Blitz your views would be quite different.
In our own time, you will have the opportunity to discuss how to counter the enemy when the enemy is a stateless organization whose primary means of waging war is to kill civilians.
For example: If certain radical forces currently beheading and burning people alive in the Middle East were to acquire a nuclear weapon or weapons and activate them in New York, Chicago, Los Angeles, London, Paris and Berlin, what would be the proper moral response?