If you can find per-capita homicide rates disaggregated by race in other countries, that would be most welcome.
Besides, others seem quite confident the issue is guns. Without examining other causes, we can't be sure that's the case.
[0] https://ucr.fbi.gov/crime-in-the-u.s/2019/crime-in-the-u.s.-...
[1] Due to how the FBI reports Hispanic ethnicity separately from race, it is difficult to calculate homicide rates for whites and Hispanics separately, so for this comparison the white+Hispanic rate will have to suffice.
That said, mass shootings are a small part of all homicide, so they give the wrong impression of overall violent crime and homicide, and I see no justification for ignoring non-mass homicide. But the media love to focus on them to the exclusion of all else.