Because people feel that while destruction was sometimes wanton on both sides, and neither side was innocent of any wrongdoing, the Allies--- despite much more direct cause to have done so than Germany had when it came to the Jews or other "enemies" of the German State, didn't set up camps for the industrialized mass destruction of the German people. Nor did the Allies carry out such a thing on the Japanese, or any other group during the war.
Kicking someone out for being x ethnicity = not a moral thing to do
But in the greater context of the war? To point out that this happened and then insist that the countries doing so made the anti-Nazi war effort every bit as immoral as Auschwitz or the final solution is offensive to many, and, I believe, logically unsupportable.
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