That is one of the aspects of the Second World War that made it stand apart, the civilian toll was staggering. In modern times, "professional armies" place so much emphasis on limiting collateral damage, that there are instances when it has cost service members lives, through denial of artillery, fast air, and other area effect weapons. However that is necessary the evolution of the laws of armed conflict, and the application of warrior ethics, humanity reaches a very ugly tipping point when unrestricted warfare is conducted without regard for non-combatants.
While no side is ever completely faultless in a war, the conduct of the Axis powers during the Second World War was especially reprehensible. I believe these horrible actions galvanized the majority of the Allied forces and their civilian population into supporting the "war effort". This was probably a different social atmosphere than most modern conflicts where the majority of "folks at home" have never had the war show up on their doorstep, or in the case of Flying 10's father, had an enemy bomb detonate in their garden.