Look how hard they're tiptoeing around the issue as if you can't just check and see who commits the who most crime per capita in the US and see that there are zero of those people in Japan. Gee, what could be the issue I wonder.
It's ironic that you talk about "tiptoeing around this issue" and then completely lack the spine to actually go full racist and spell out "black people".
Also, my country has very few black people and still a lot of vandalism, dirtyness, rudeness, so maybe it's something else that explains the special situation of Japan and not just "black people bad".