Wow, you guys need to lighten up. Merely mentioning hitler in a song isn't a racist comment. And taking a made up word like "niggerslut" as a serious insult is just plain dumb. They were a black metal band, what do you expect, make love not war songs, or songs about how much they love their grandma? Black metal bands are about offending people most of the time. Ever heard of the phrase "tongue in cheek"? Slayer's angel of death has a lot of hitler-isms too, does that mean that band (fronted by a christian, chilean man) are racists seriously promoting hatred? Or what about dragonforce having members from hong kong, south africa, ukraine, and new zealand?
Anyways, i'm sure a lot of your "clean" bands have racists members that just keep it out of the music. And even if it is in the music, its MUSIC, just listen to it if its good and enjoy it. And have you never said a racist comment in your life, maybe joking, that you might now regret?
I have one of the demoniac albums, the fire and the wind. To me it is just silly black metal fun, with insane shredding guitar solos and campy vocals and tongue in cheek lyrics. I am not racist (mostly), but if any racist person would read the lyrics and take them seriously, they are dumb too. the end. lighten up.