The Nazi conception of the world was fundamentally racist.
They had a crusade-like vision of saving western civilization from Jews.
They had a strategic vision of a dominant German "Aryan" race ruling subject peoples.
They believed "superior" races had not just the right but the obligation to subdue and even exterminate the "inferior" ones.
To ensure the racial superiority of Germany, they instituted the continual self-purge of their society.