Well, obviously it's because there is a long history of white cops killing blacks, one that goes back to the origin of policing with the Slave Patrols. Of course that's going to take on a different meaning because there is a social and historical context there.
NY wasn't a slave state. NYC's police department was formed
in 1829. It was modeled on London's. So we have a history of
policing existing without slave catching being its function.
(NYC has long been a hotbed of violent corrupt policing.)
But even if policing were once about slave catching, this doesn't
justify racist coverage of wrongful policing.
There's a long history of white cops killing white people...even
more of them than blacks in total number. Yet the media portray
all killings of blacks as racist. If white cops killing white men (95%
of deaths) isn't racist, then why are all killings of blacks racist....even
when it's black cops doing the killing? And why isn't racism the
explanation when black cops kill whites?
Such racist coverage in news is the reason (IMO) that whites see
deadly policing as merely a black problem. This (IMO) is why we
see so little impetus for policing & justice reform.
Racism is complicated, eh.