All of their victims were white, their "greed" directs them to whites for two reasons. One, they hate all whites, two, the whites have what they want but will not work for and will take by force.
The author evidently has never been in any association with this sub-culture, to understand or know what hatred is.
Are we to understand that greed for material things extends to sexual needs also???? Only a person totally biased or ignorant of that culture would ever believe that the hours of sexual conduct, was in any way "normal", to satisfy their needs. That was a perfect example of their pure hatred of whites.
Then to cap it all off, to run over them with a truck, certainly had nothing to do with greed. It was pure unadulterated hate. People are already dead and they need to demonstrate that hate by running over the dead. What animals.