Usually I don't care what rappers (or former rappers turned kiddie movie stars) have to say about anything in life, but I thought it was worth repeating what Ice Cube had to say on racism in an interview. (I was watching it on TV so I'm paraphrasing).
"Racism is a cancer of our nation."
"Racism is like a fart that's always in the air; sometimes you get a strong whiff of it, other times it's just a faint sniff. But it's always there."