It has everything to do with race, blacks disproportionately make up the majority of violent crimes and felonies (over 60% as of 2022), and many of them make a career out of it, due in part to diminished mental faculties, among other issues, some dude who has spent his entire life in and out of a prison cell for exceedingly violent or heinous crimes, even removing race from the question, is inferior to someone who is a productive member of society working in an invaluable career like medicine or engineering, and as such, if a cop accidentally kills the former, it may be a personal tragedy to his/her family, but it doesn't really negatively effect society, by contrast, the latter is irreplaceable.