Hitler thought he was good. Those who followed him thought he was good. In the narrative and perceptive reality of nazi Germany he was good. My grandmother waxes lyrical about the wonderful and charismatic Herr Hitler (she's Austrian, was a hitlerjugendherberge), and listening to her makes oh so clear the dreams and glory that hitler successfully sold to the very disillusioned masses.
He wasn't evil. He just served a moral code so alien and repulsive to us today that we write it off as "evil". In fact, at the time, his politics were aligned with those of the US, UK, and other allied powers - eugenics, fascism, and antisemitism were rife in all - but it was their expansionist policy which ultimately led to the branding as evil and ww2.
Don't get me wrong - I'm no apologist - but I do try to understand events from a contemporaneous and empathic perspective.