I think accusing metal of being racist for not having black people is like accusing rap music of being racist for not having white people. It's kind of silly and shortsighted.And Eminem doesn't count.
I'm the fucking Han Solo of forum politics.
Reams have been written on the subject. It's culture. You get less black metalheads, and so less black people in metal bands. It's not active discrimination inside the metal scene, apart from a very few people, so much as people just not being interested.
I liked The Decemberists before I knew that they made music.