O-Dog himself can be seen as this. Mercilessly kills a man and his wife in a liquor store, it gets worse when steals video tape and use it as a method of humorous entertainment for him.
The scene where Caine and a friend were attacked by a rival gang in a car, and then one of them shoots the driver in the head, jumping blood to the windshield. Quite disturbing, the worst part is that it only did so For the Evulz.
Also, the scene where Caine is bleeding by the shot he received.
The quietly terrifying detective, played by Bill Duke.
Caine's death. He is shot and is bleeding to death.