希特拉的錯誤

Hitler thought that the Jew will bring back luck to German and so he started genocide aimed to kill all the Jews.After the end of the WWII,there were fewer of jews left.
Beside, he annoyed with people who didn't agree with him and send them to the concentration camp and killed all of them with toxic gases.
Finally,Hitler is aggressive which he was started the expanding pilicy.As he invaded other places,for example poland, it pay the way of the starting of WWII which bring horrible effects.

I can only think of 3 reasons...