If Dexter ran, Harrison would follow. He would hunt. He would become the monster.
In the aftermath of Anton's death, Dexter is forced to confront the consequences of his actions. He confesses to his son, Harrison (played by Cooper Horowitz), about his Dark Passenger and his need to kill. Harrison, surprisingly, takes the news well, and the two share a moment of closure. finale dexter new blood cracked
This was the moment. The TV show logic dictated he run. He should drag Harrison out, steal a truck, disappear into the Canadian wilderness. He could do it. He could still fix this. If Dexter ran, Harrison would follow