Well from the way I see it, if other countries were to get in on the holocaust it would just make it worse becuase then Germany would have to start a war with those countries and it would be a big mess and I’m sure other countries feared that something like that would possibly happen which is why they didn’t act upon it and if they did they would be causing problems for their own country which is what they didn’t need.
Hitler promised if he was elected chancellor he would bring Germany back to its prime. Which he basically did. After the lose of WW1 hitler was furious that Germany lost. Along with all that Germany had to repay to the allies hitler sought that it was time for Germany to become great again so he wrote Mien Kampf in prison about his struggles to bring Germany back to its glory days all he needed was the support of Germany.
Answer:
Being open to the opinions of others