You asked rhetorically, “... Because all the shooters & victims are black?” So by “involvement” I mean in the sense there implied. Read the article.
Of course, I am going by the names of the two victims in one of the double homicides. This is by no means conclusive, which is why I said “suppose”. Looking at Google Maps, the victims lived in North Lawndale, adjacent to West Garfield Park where they were killed. Wikipedia lists these neighborhoods as 91.43% and 96.19% black, respectively, so I dunno. It’s a question.