The thing about separating the work from the author is that it's a social process, not an individual one. You can cite Heidegger nowadays without it being an endorsement of Nazism because the philosophy world spent literally decades discussing how fucked up Heidegger was. If you go to a Graveland or Peste Noire concert, though, because you personally feel you have separated the work from the author, you are just endorsing Nazism because the guy standing next to you is definitely a Nazi