Nationalism is not about committing atrocities but to have an independent national identity, thought process, culture and vision.
Enabling (external) revisionist dogmas to dictate thought process of citizens is problematic, and would prevent your country from rediscovering its potential in all fronts. Post-WW2 Germany is a feeble indoctrinated footnote in the Anglo-Saxon course; it have a seemingly non-existent national identity of its own and blindly embrace revisionist Western LEFTIST thought process and values.
Take a good look at China. They retain an independent national identity, thought process, culture and vision, irrespective of their dealings with the rest of the world. China is a superpower consequently.