Horrible atrocities aside, there was a very certain and clear aesthetic to them, the Third Reich had manipulation for the most part down to a pinch, as shown in how they normalized their actions They seemed to present the initial idea of being clean, disciplined, and strong. You can see it in how they presented themselves: their uniforms, the color psychology behind it, their general shape language, and distorted use of the swastika a former symbol of peace.
Thinking about the swastika, a lot of their aesthetics used this tainted version of peace to really drive in their ideals subconsciously, and its disgustingly good at what it does, considering how we think of it today.