You shouldn't tear people to pieces.
Barry suffers from strong urges to hurt a woman who lives next to him.
Barry wants to get relief from his urges.
Barry goes to therapy and talks about his issues and works to improve his outlook.
Barry abducts the woman and kills her and cuts her up into chunks.
Barry stops fixating on the woman and gets his life together, and the woman doesn't lose her life.
The woman loses her life, and Barry becomes a wanted criminal.