"The whitewashing (a great term, btw) of the word describes a deliberate process of creating a contranym. Whites want to shed the notion that they're the bad guys, the ones Blacks have to fear. It's all wrapped up in their minds with the negative associations they have with Black people, that they're the dangerous people. It's also what they're doing now by trying to equate pedophiles with gay people, another group they think are dangerous."
By the way this is an incredibly useful breakdown you've written here. I encourage you to expand on it. It deserves to become an article by Jim Bauman.