Nazi ideology was fundamentally self-destructive and incompatible with rational leadership, and Hitler's drug use contributed to his decline as a leader.

“Hitler was a self-destructive personality, and National Socialism is a self-destructive movement.”

Dominic Sandbrook asserts that the Nazi German military structure suffered from a lack of combined services and poor organization.

“the mad thing about this is that um there's no kind of combined services general staff. So the the admiral and the general are not talking to each other. So all the planning for kind of amphibious campaign, they have no concept of how to launch an amphibious campaign”