Hitler was embarrassed of the German peoples history
Heinrich Himmler was obsessed with religion and German pre-history. So much that one of his pet project involved archaeological digs throughout Germany. Hitler hated them because they disproved the Aryan narrative he was trying to form.
"Why do we call the whole world's attention to the fact that we have no past? It's bad enough that the Romans were erecting great buildings when our forefathers were still living in mud huts; now Himmler is starting to dig up these villages of mud huts and enthusing over every potsherd and stone ax he finds. All we prove by that is that we were still throwing stone hatchets and crouching around open fires when Greece and Rome had already reached the highest stage of culture. We really should do our best to keep quiet about this past. Instead Himmler makes a great fuss about it all. The present-day Romans must be having a laugh at these revelations." - Hitler
Meanwhile the entire infighting itself
Then you look at the Wehrmacht
A lot of the Generals were ex WW1 veterans. Of course they would disobey orders from a Socialist.