I think you made a good the point there, Murica, in the last sentence:
When Gabby Petito was missing in the American west there was wall to wall news coverage about it. After she was found news coverage berated us for not caring about non white women going missing. Women people didn't know about because news stations don't report about them.
As you say, the US media don't report about missing women who aren't white, and this must really anger the families and communities of the murdered and missing women and children who don't merit the same media attention because they are the 'wrong' colour, and therefore don't matter.
Obviously that doesn't justify downplaying tragedies just because the media found the young White blonde victim more photogenic - a tragedy is a tragedy is a tragedy.
But the relative lack of media attention when Black women and children go missing has life-or-death implications - it means that they are less likely to be found while in the short window of opportunity when they may be found alive.
Maybe somebody with Film Studies knowledge could confirm this, but aren't female murder victims in crime films usually young, white and blonde i.e. the 'ideal' victim of male violence, precisely because of their relatively privileged social status?
Maybe this also influences the media in which victims to prioritise.