Because it never happened. We desperately needed those Germen POW solders to help rebuild Germany after the war so the USSR could not take it over.
I read that a rather large number of German POWs remained in the US after the war because there were few jobs for them in Germany. Additionally the remittance from the wages they earned was desperately needed in Germany.
How Anti-Semitic of 20,000 Boer children to be in the way of gold mining, and 500,000 civilians to be in the way of British and American firebombing.