Thanks for trying to clarify the question.
As I see it, the world today is a lot 'smaller' than it was during previous wars. In WW2 we didn't have reporters/drones/TV stations in the 'front line' bringing us all the horrors and carnage that results from a war, on a day to day basis, into our living rooms.
Germany defeated and occupied Poland (attacked in September 1939), Denmark (April 1940), Norway (April 1940), Belgium (May 1940), the Netherlands (May 1940), Luxembourg (May 1940), France (May 1940), Yugoslavia (April 1941), and Greece (April 1941).
In order to defeat the Nazis and stop their advance across Europe the Allies killed 67,000 German civilians in bombing raids.
1,600 were killed in the Dambuster raids alone.
Nazi Germany attacked the Soviet Union in June 1941 (their biggest mistake of the war). It took the country four years and a tremendous military and civilian effort to achieve victory. About seventeen million Soviet citizens died in WW2, the largest death toll of any country. The victory was possible due to greater willpower (Soviet citizens defended their own country against an invader with genocidal plans) but also bigger industrial and human reserves.
A quarter of the people in the Soviet Union were wounded or killed.
Because of the sacrifices made by others, we now have the ability to live in free society and post on forums instead of being under the Nazi Jackboot.
Would people posting on this forum prefer that UK had rolled over and let us be invaded? Would they rather be now ruled by a genocidal, elitist, fascist regime that started by murdering gypsies/vagrants/children with mental & physical disabilities?
The Holocaust didn't start with the Gas Chambers - it started with the so-called Nazi Euthanasia Program which targeted for murder Germans with mental and physical disabilities. It claimed the lives of an estimated 250,000 people, many of them children, by 1941.
Were the casualties and horrendous death toll of WW2 (bothy civilian and military) a fair price to pay for stopping the Nazi Killing Machine?