Because most people who use that rhetoric will always imply the disparity exists because of genetic disposition rather than a social one. The logic tree goes from "black people commit a lot of violent crime" to "black people are dangerous" (then from there to other various racist tropes), while ignoring the mountain of other socioeconmic issues.

Consider this, if I told you Koreans only make 1% of Japan but they make up 70% of the Yakuza, what would you take away from that? The observation is true. But do you think I'm making a fair implication about Koreans in general? What if I said next that the Japanese police should be free to treat Koreans anyway they fit? Would you agree to that? I hope you would see that as insane, but that is line of reasoning that always happens with 13/52.

So currently when I read "black on asian violence is increasing" I'm not sure yet whether I can believe the author is making a fairly reasoned observation about black people ideologically attacking asians, or if they are calling for a "force" to "take a closer look at those black people".