Racists play that numbers game constantly. Let's take a look at the actual figures:
Roughly 80% of the US is white. About 13% is black.
https://www.cia.gov/library/publications/the-world-factbook/geos/us.html
So, assuming a criminal isn't biased at all, he should be attacking about 6.15 times as many white people as black people. Now let's take a look...
If they were just randomly picking victims with no racial bias at all, black on white violence should be about 6.15 times as common as white on black violence. (because there are about 6.15 times as many whites in America as there are blacks) But it's only 5 times as common. So there's some kind of bias going on here. Either blacks are avoiding attacking white people, or white people are targeting blacks.
So a rational analysis would indicate that white bias against blacks is significantly more common than black bias against whites. Which, given our history of institutionalized racism, isn't surprising.
What's remarkable is how far we've come in a few generations. Which, I suppose is why racists are so desperately eager to peddle their foolish assumptions to the rest of us.
And yes, the final racist refuge: "They are all lying!"