I think that the fact that this wasn't "just a carjacking" and that gruesome things were done to each of the victims and the length of time they had them before they killed them are all indications of racial hatred. If it was just a carjacking, they would have forced the victims out of the vehicle and either shot them or just left them where they took the car.
It was a major hate crime but was not prosecuted as such. The DA is a coward.