This is always going to be thorny because it depends what you mean by personhood or humanity, or whatever term is being discussed.

Some people view acknowledging that everyone possesses these innately and indelibly as akin to saying they're an adequate or worthy person. Not unlike how some people get offended when you call really shitty art what it is - art (albeit shitty).

I'm not going to defend Nazis, but I fall in the indelible camp. To me it's like acknowledging that someone can feel pain. It's just a matter of reality.