[tomp]

I think it's far more complicated than "racism / xenophobia".

Hitler had delusions about "Aryan" race, white blond people, even though he was not blond. Also, the war was mostly fought in Europe (or at least started in), i.e. mostly among people of the same race.

It couldn't have been "xenophobia" either, given he wasn't even German!

A lot of people who were sent to the concentration camps, besides Jews, were Roma (Gypsies), gays [1], Slavic people, probably more.

I havne't studied history that deeply, maybe this talk about "undesirables" was all just propaganda, conveniently constructed to help fulfill military goals, but it's clearly far from neatly fitting "racism / xenophobia".