The Germans started the war by mass, indiscriminate bombing of civilian targets, and they continued doing it throughout the war.
The V-1 and V-2 rockets, for example, had only rudimentary guidance systems and were simply designed to hit somewhere in a large city such as London.
My memory is that the British tried daylight bombing but found it was suicidal to continue it, and so they went to bombing at night. The British did not have an infinite supply of airplanes and airmen to continue suicide attacks.
The American Air Forces came in to Britain and tried to rely on "precision" daytime bombing.
It was clear to most people that there was very little precision about it, but the US, with a larger supply of aircraft and airmen, continued with what amounted to a suicide campaign against Germany for quite a while.
The theory was that until a ground war against Hitler could be mounted, something had to be done to show we were actually risking something in the war, especially given the slaughter that our allies the Russians were enduring.
The losses got so horrific, of course, that the US pulled back on its missions until fighter planes became available that could provide cover all the way into Germany.
The architect of the British bombing campaign against Germany, "Bomber" Harris, offered a number of pertinent defenses of the bombing:
Quote:
The Nazis entered this war under the rather childish delusion that they were going to bomb everyone else, and nobody was going to bomb them. At Rotterdam, London, Warsaw, and half a hundred other places, they put their rather naive theory into operation. They sowed the wind, and now they are going to reap the whirlwind.
We are going to scourge the Third Reich from end to end. We are bombing Germany city by city and ever more terribly in order to make it impossible for her to go on with the war. That is our object; we shall pursue it relentlessly.
In spite of all that happened at Hamburg, bombing proved a relatively humane method. For one thing, it saved the youth of this country and of our allies from being mown down by the military as it was in the war of 1914-1918.
Attacks on cities like any other act of war are intolerable unless they are strategically justified. But they are strategically justified in so far as they tend to shorten the war and preserve the lives of Allied soldiers. To my mind we have absolutely no right to give them up unless it is certain that they will not have this effect. I do not personally regard the whole of the remaining cities of Germany as worth the bones of one British Grenadier. It therefore seems to me that there is one and only one valid argument on which a case for giving up strategic bombing could be based, namely that it has already completed its task and that nothing now remains for the Armies to do except to occupy Germany against unorganized resistance.