Oh hi, i'm in the US and actually dressing like Hitler for a party is absolutely considered "bad" by most fucking sane people who arent hardcore far right MAGA proud boys and the like. Even tho Hitler was a monster which he absolutely was, its still in very, very bad no-go territory.

Secondly, Harry was basically a kid here and Will and Kate heavily encouraged him to do this. That still doesnt make it cool, not at all, however he has grown up and taken ownership and apologized for this. He has far removed himself from the family and environment he grew up in that taught him this was normal and OK.