European anti-Jewish and Jew hating sentiments were even more virulent than anti-Jewish sentiments among Muslims, before 1948.
The Holocaust was executed by Nazi germany but the conditions giving rise to it were created all across Europe over many centuries.
The Spanish writer is correct; he knows European history; he knows the Holocust is a stain on Europe, not just Germany.
It’s a stain on Western culture.
The one bright note, when it became common knowledge as to what happened, I think it sped up the elimination of racism.