A lot of people seem to think that the Second World War was a plain good versus evil, here's same food for thought (this obviously applies even today) : many (if not all) history books used in schools today seem to forget the Allied bombings of Dresden and Hamburg, and the firebombings of Japanese cities.
Unfortunately I don't have any exact figures, but thousands, maybe even tens of thousands people died. I doubt that these bombings had much military value, since the civilian to military casualty ratio was propably something like 99:1. The Allies or the "good guys" simply bombed the hell out of them.
Of course I know about the German bombing of Coventry, but how are "we" any better than "them" if we kill in "retaliation" 10-times the amount of civilians? I though "we" were supposed to be "civilised"?
The same **** goes on and on today, as demonstrated by the aerial bombings of Iraq during the war. How many civilians got killed then?
The nature of war in the 1940s was complete and utter destruction of the enemies civillian population, as said population provided the material support to persue war; the widescale devastation is simply a consequence of having the munitions but not precise aiming.
In terms of 'good versus evil', it's important to place it in context. During WW2 the accepted tactics were targeting the civillian population i.e. as above. So both sides did that; there was no other real way to fight a total war beyond removing the civillians' will to support the fighting (in truth, bombing was often counter-productive in this sense) - WW2 was not just a clash of armies, as pretty much every major war since has been, but of entire mobilized nations, and one where the cost of defeat was not monetary or territorial, but the loss of your country, freedom and culture. i.e. the stakes were very high.
However, the reason the Japanese and Germans (in particular; noting the other Axis nations' actions are less well publicised in mainstream history teaching/media) are classified as evil is twofold. Firstly, the victors write the history. Secondly, those nations (again, in particular) performed several morally wrong actions that the 'good' side (the allies) did not (the exception being Russia, but it's worth noting that the British/US cultural history of the war tends not to focus on their pivotal role) - the Japanese places prisoners in apalling conditions and used them as slave labour, the Germans sought to literally exterminate several (Jewish, Gypsy spring to mind) ethnic groups (as well as again using them as slave labour) in a tightly controlled and planned program of genocide.
It's also worth mentioning that Germany and Japan were the aggressors; in other words the tactics they used resulted in reciprocal actions and tactics from the Allies, and they sought to exert rule over other soveriegn nations. The only questionable mark over the Allies being 'good' is the Russians; in my experience, though, Stalin is far from exempt from criticism on this (not to mention his actions afterwards in the purges and gulags), and the general - perhaps stereotypical - view of the Russian army is of conscripts forced to fight en masse in horrible conditions, by selfish and/or inept leaders, rather than a heroic force of liberation.
But bear in mind 'good' is within the context of war.