Nobility and necessity aren't the same thing- it's necessary to defend oneself, in and of itself, nobility is something else, it represents an ideal. That comes from the past, and typically from the Romantic age, in fact, in order to understand the basis for Nazism, one should understand idealists like Fichte and the Romantic age of writers who looked to the past- kingdoms, simple peasant life, rolling countrysides with castles and held that in esteem over the modern age. As an ideal, that doesn't really compare to industrial scale warfare. It's portraying something in quaint terms when the reality of it doesn't resemble that at all.

Look at the current civil war in Syria- whomever is defending themselves in that war, whatever case is made for the "defender", they die and look just as mangled and anonymous in death as the "aggressor", or like any other combatant in any other war.