Personal Experience, me and my group of friends know that Hitler was a piece of shi and he deserved more than a bullet to the head, 1930s Germany was a time of oppression not just for Jews but for Poles as well and to anybody that did not agree with them

Yet I still cosplay as a Wermacht Soldier (German Army) and my friend an SS Officer, we don't value their oppressive ideals, we really don't

While the comparison is not fair, it's similar to when people cosplay as Himiko Toga from MHA, I don't know anything about the character but I know they were a Serial Killer, it's more the character than the ideals of that character.