"There's no one here, Dad! It's just us!"
The finale centers on Dexter’s ultimate reckoning, driven by his relationship with his son, Harrison:
Dexter spent years teaching the Code to protect Harrison, only for the Code to be the very thing that justified Harrison pulling the trigger. The Verdict:
The confrontation in the woods was Shakespearean. Dexter, realizing he has turned his son into a killer, gives him the gun. He tells Harrison to shoot him. It’s the only act of true selflessness Dexter has ever committed. By asking Harrison to pull the trigger, Dexter finally adheres to the code he broke so many times: He removes the threat to the innocent. He realizes he is the threat.
Dexter asks Harrison to shoot him, admitting he is the true "Dark Passenger".