The largest fundamental problem was the social acceptance of Hitler and his actions... the acceptance of going to war, in effect. It required a whole lot of manipulation, granted, but the society was military-complexed and nationalist to ignore the ramifications. Bombs should be the last solution for it is the most costly solution - there comes a time when it is needed, but the issue is for the next war. The war killed an estimated 25+ million military people... and an estimated 40+ million civilians, not including the civil deaths, such as the Nazi gas camps. Even if WWII was required, it does not justify the war complex, for that conditions the populace for WWIII.
War is purely destructive and is to be avoided up to the point where it cannot be. To glorify war itself is to minimize the needed restraint before going to war. It is needed on both sides - one side must be the aggressor, and that is where the most prevention is required. But it is difficult to see who will become the downtrodden, who will be wronged... Every country needs restraint. Glorifying war weakens that restraint.