It was through Propaganda and Silencing of people lead to people denying the fact that the holocaust was happening, and only rumors about concentration camps where among ally troops until they finally liberated them.
The holocaust was the mass genocide of jewish people by the nazi party so the so called "superior" german race could rule over Europe. Nazis beliwved jews were the rats that were investing Europe.
The most urgent need was coal and iron.
Only that they both deposed an unpopular king. After that they differ....The British 'Glorious' was done without bloodshed or violence, and a new Queen (the deposed Kings daughter) was right away placed on throne as new leader, leading to peace and prosperity.
The French...was done with lots of violence, rioting and bloodshed including the execution of the deposed king, the queen and their children. The French never got around to placing a new king or leader on the murdered king's throne, so chaos was the result.
Hitler was raised thinking and learning that only whites deserved to be alive, it's like we have the same beliefs as are parents. His army was the same way. He only taught what he knew, which is sad.