The Joker in The Dark Knight summed it up well why people respond this way.
Young black men, killed by other young black men, is not news.
85% of murder VICTIMS in Chicago have a criminal record. Most of Chicago killings are thugs killing other thugs.
Still, if Gabby Petito was fat, no one would be following the story. Hot girl killed and fiancé acts incredibly suspicious. That makes it a story with legs. Because she had good legs.