Johnny Gat burying the Ronin's leader alive.
You planting the Brotherhoods leader's girlfriend into a Car Trunk, as the Leader unwittingly crushes the car and her.
You, stabbing the leader's father of the Ronin in the Shoulder, twisting the blade and then leaving him to burn to death.
Johnny Gat, faceplanting a Ronin goon through a glass table before shooting him in the back of the head.
You, stamping on the Tattoo-ists arm of the Brotherhood and also Feed Dogs frontman, snapping his wrist, and then letting fireworks burn him.
You, shooting Mr. Sunshine multiple times in the chest, only to have him get back up twice, before you eventually behead him and dump his head on a meat conveyor belt.
Just to name a few, and those are just cutscenes...