It seems the general public outside the affected regions were not completely aware on what was going on with concentration camps. This does not mean they were not aware of at some level.

It is quite common for old people to say that they only became aware of many of the atrocities months or years later the war was over. The US was not keen on putting pressure to concentration camps as, well, they had their own full of "japs and n*"

While I have some sympathy for them, it diminishes every time their boss opens his mouth.