Sure, but there are certain things as which one should never dress up in Germany. Don't you think parents should think twice before letting their kids dress up as the displaced indigenous victims of genocide? Context and history matters.

I would argue those types of rules would eliminate most historical outfits, because they’d either have been the oppressed or the oppressors.

Nevrtheless, German kids dont cosplay as SS and Jews. The cowboys in Germany are more about Karl May books which in turn have nothing to do with history.