At some point the allies decided to just fight fascism with force because the time to soul-search the Germans’ support for the Nazis just would have been a waste and delay the unavoidable.
There’s not any one seriously questioning today whether the world should have waited a bit longer to see if they could figure out just why the Nazis were doing what they’re doing…on the contrary, the consensus is that if the world had acted sooner, a lot of tragedy could have been avoided.
Americans have the chance now to stop these new Nazis - there’s no point in understanding evil.