Except the US did not go to war against Nazi Germany to close the concentration camps, but for their own self interest. Every single nation acted in their self interest during WW2, and excluding the single outlier of the Holocaust, I haven't heard of any actions by any nation that were any more or less moral than that.
Edit: My apologies, there were clearly plenty of other atrocities (eg Rape of Nanking if you consider that as part of WW2), but it is simply is not accurate to claim that Swiss were evil and the US were shining knights.
It is a common Americanism to talk like we singlehandedly defeated the Nazis, as if no other nation really contributed. I've discussed it with a few foreign friends. I am not in any shape to discuss it intelligently at the moment. Just thought I would note that this egomaniacal hero complex is one of this nation's foibles.
I don't have some across the board policy, perhaps because friends have been scarce of late. Since basically no one speaks to me, I don't currently have any need to make judgement calls of that sort. But my personal history suggests I am disinclined towards sweeping judgements of any sort. (shrug)
Edit: My apologies, there were clearly plenty of other atrocities (eg Rape of Nanking if you consider that as part of WW2), but it is simply is not accurate to claim that Swiss were evil and the US were shining knights.