Also we are currently at a point where you can find weekly stories about police abusing Latino people (typically in conjunction with ICE). No idea how you came to the conclusion that these stories are unpublished.
Law enforcement abuse stories about treatment of white and (especially) Latino people are published regularly (rarely, with white people, is there a basis even for suspicion that the act is racially motivated), and frequently are divisive (even, if when it is about whites, not usually about race/ethnicity).
being profit-seeking corporations, american news is pursuing eyeballs and clicks. truthiness, accuracy, bias, etc. are all variables in the profit equation, and not always a major influence. if idpol (or whatever) is stirring up the viewership, it will influence how they approach the "news", in different ways depending on who the producers view as their principle audience.
inserting the whole "seeking to divide" as a concrete motive seems like a dogwhistle (particularly being a narrative beloved of antisemites).
Yes, the media indeed loves to intentionally psychologically trigger people.
Police brutality happens to white people and latino people as well (at lower rates, but in greater numbers), but such stories wouldn't psychologically trigger/racially divide people and so they remain unpublished.