Well, there's more to it than that.
Anna Nicole Smith was hyped no end in part because she wasn't threatening as an icon. She was the darling of the tabloids because of her outlandish behavior (getting stoned while pregnant, for example.) She craved the spotlight and everyone seemed willing to give it to her.
Yolanda King, on the other hand, wasn't really known for doing things like that. (Probably due to her father being a reverend.) King worked for equality between African-Americans and whites - a very noble cause. What causes did Anna Nicole Smith support?
The true underlying problem is this: Americans are being stuffed with placebos to cover up the real problems, none of which have simple solutions. Pollution, overpopulation of the planet, running out of oil, Iraq and much more are getting shoved to the back in the American mind because our leaders don't want to tackle these problems. They want us to feel good while they do their evil.