onlymorelove

To put in my two cents on the matter of ZackThink (TM) (thank you mistletoe): I think that Zack believes that his actions were a 'condition sine qua non' (the condition without which it could not have happened) for the murder and therefore he killed him, whether it was with his own hands or not. In the context of the rest of that conversation with Sweets, he seems to be saying that it's his way of accepting responsibility for the actions that led directly to the victim's death.