Why is it racist to talk about black on white, or black on black crime, but its not racist to talk about white on black crime?

Its not something i understand. The statistics state that black on white crime is WAY higher than white on black crime.

Recently there were two black men who shot and killed, in cold blood, a white man while he was installing a mailbox. The reason they gave investigators that they shot him was simply because he was white. Yet the lawyers for these two men are trying to get the crime reduce to man slaughter for what was obviously first degree murder and a hate crime.

Why is it racist to talk about black on white, or black on black crime, but its not racist to talk about white on black crime?
Why is it racist to talk about black on white, or black on black crime, but its not racist to talk about white on black crime?

Side note, Any one trying to justify their crimes will be both reported and removed from my post.

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Also any racist or hateful comments from either side, any failure to keep it civil, will be removes as well. My intent is to ask a question not to point fingers.
Why is it racist to talk about black on white, or black on black crime, but its not racist to talk about white on black crime?
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