> why do you expect the media to report on the ethnicity of the people involved?

Because they do - albeit selectively. Since the original source of this story (https://apnews.com/article/zizians-killings-border-patrol-bf...) is the Associated Press, here are the results of "killed by white site:apnews.com" from duckduckgo.com:

- Black Florida mother killed by white neighbor remembered for faith, devotion to 4 kids - https://apnews.com/article/neighbor-shooting-florida-manslau...

- White Florida woman sentenced to 25 years in prison for shooting Black neighbor in lengthy dispute - https://apnews.com/article/neighbor-killing-florida-prison-s...

- Vigil honors 2 Black residents killed by white man - https://apnews.com/article/ri-state-wire-ma-state-wire-shoot...

- Body camera video shows fatal shooting of Black airman by Florida deputy in apartment doorway - https://apnews.com/article/florida-deputies-black-airman-kil...

- White Nebraska man shoots and wounds 7 Guatemalan immigrant neighbors - https://apnews.com/article/man-shoots-immigrant-neighbors-7e...

- Attorneys for family of absolved Black man killed by deputy seeking $16M from Georgia sheriff - https://apnews.com/article/georgia-deputy-kills-exonerated-m...

- Mississippi judge declares mistrial for 2 white men charged in attack on Black FedEx driver - https://apnews.com/article/mississippi-fedex-driver-shooting...

- St. Louis chief: Black male shot, killed by white officer - https://apnews.com/general-news-9e94f2803d4f486da57c94707304...

I've filtered it down to only where race is mentioned in the title itself. Plenty of results for the intended query. Notably, there were zero results (in this search, and judging by the title only, in the first ~5 pages) for white victims - it correctly parsed "killed by white" to include only white perpetrators. Results for "killed by black site:apnews.com":

- Killing of an airman by Florida deputy is among cases of Black people being shot in their homes - https://apnews.com/article/police-shootings-home-roger-forts...

- Family of exonerated Black man killed by a Georgia deputy is suing him in federal court - https://apnews.com/article/deputy-kills-exonerated-man-lawsu...

- Guilty verdict means “some justice” for Black mother killed by white neighbor in Florida - https://apnews.com/video/ajike-owens-florida-crime-juries-ho...

- Bodycam video reveals chaotic scene of deputy fatally shooting Black woman who called 911 for help - https://apnews.com/video/illinois-shootings-law-enforcement-...

- Arrest made in beating death of pioneering Black Bronx rocker - https://apnews.com/article/peter-forrest-247-spyz-rock-band-...

- Homeowner pleads guilty to shooting Black teen Ralph Yarl who rang the wrong doorbell - https://apnews.com/article/ralph-yarl-shooting-andrew-lester...

- Investigators name the trooper who fatally shot a Black Minnesota man during a traffic stop - https://apnews.com/article/minnesota-black-man-shot-traffic-...

Again filtered for only cases reporting on killings, where race is mentioned in the title. In the first ~5 pages, there were zero results (judging by title alone) about black perpetrators - all the stories were about black victims, even though it had no trouble parsing the query correctly when asking about white perpetrators.

This is despite the fact that in 2019 (the most recent year for which the FBI published this data [1]), there were 566 black-on-white killings, and 246 white-on-black killings (where the FBI includes latinos in "white"). So it's not that the AP's reporting simply reflects reality. Their journalists are simply following the official AP style on race - only identify it when it is "pertinent" [2]. It just so happens that when a white kills a black, race is pertinent, and when a black kills a white, it is a "random act of violence".

[1] https://ucr.fbi.gov/crime-in-the-u.s/2019/crime-in-the-u.s.-...

[2] Consider carefully when deciding whether to identify people by race. Often, it is an irrelevant factor and drawing unnecessary attention to someone’s race or ethnicity can be interpreted as bigotry. There are, however, occasions when race is pertinent - https://web.archive.org/web/20220715000414/https://www.apsty...