Conveniently ignoring that they were well-defended with radar networks, anti-aircraft artillery, day and night fighters, and bomb shelters.
As I have stated before, strategic bombing was a blunt tool. But it was the only tool available for striking at an enemy's means of producing war materiel.
I've emphasized the word with which you seem to be having trouble. If you can name a way in which WWII could have been fought without it having any impact on civilians I'll listen.
And in any case you have not obviated my central point: in an industrialized nation-state the economy is the foundation upon which the military rests. Feel free to cite how long the German military could have lasted had it not had civilians building it new tanks, rifles, artillery pieces, fighters, bombs, bullets, shells, land mines, uniforms, boots, barbed wire, submarines, destroyers, torpedoes, etc. Feel free to cite how long the German military could have lasted had it not had the civilians digging out the coal which was needed to (a) fuel the electrical plants which in turn powered the factories which in turn built armaments, and (b) fuel the railway locomotives which in turn moved the raw resources to the factories and the finished war materiel to the front. Feel free to cite how long the German military could have continued on had it not had civilians working in the oil refineries which provided the vitally necessary gasoline, or civilians working in the chemical factories producing the nitrates and other chemicals without which explosives and bullets could not function, or in the foundries which produced the steel without which there could be no more tanks or warships or guns or bullets.
And so on and so on.