Am not blaming the Allies for the murderous sins of the enemies.
But where there is not active resistance to evil or even not enough resistance, then evil will prevail until it is destroyed.
The PERCEPTION was that America would not actively aid England or France nor the invaded and raped countries in Asia and the South Pacific.
If not for Pearl Harbor, the perception would have been substantiated much longer - maybe to the point where the Axis powers could not have been stopped.
As it was, they got damn close to that point. More than almost all persons realize.
The Allies' victory in WWII was by no means assured; and the true cost remains really beyond conception.
Because in the heart of the depression, the American people were almost universally against another foreign war. Moreover, there is little the US could have done. In 1939, the US had a smaller army than Rumania.