Humanity vs. Monstrosity: The Blurring of Boundaries

The Dilemma of Defining Humanity: Patient or Species?

The most philosophical question I Am Legend poses is: 'What is a human being?' Against the backdrop of a biological catastrophe — viral infection — the film ceaselessly questions where the essential boundary of humanity lies. Protagonist Robert Neville looks at the infected, whom the virus he helped create brought into existence, only through the scientific lens of 'patients who must be cured.' His every action is carried out under the banner of 'salvation' and 'scientific solution.'

Yet the behavioral patterns the infected display are difficult to dismiss as mere symptoms of disease. They are not simply zombies attacking at random. Rather, they form packs, maintain clear hierarchies, and react sensitively to specific stimuli (blood, light) — making them closer to an 'evolved species.' This suggests the infected retain vestiges of the 'human' mutated by the virus, implying their survival instinct is the result of combining with human-level intelligence.

Neville's Gaze and Moral Ambiguity

Neville designates them as 'sick' and tries to find a cure using his own immune system through blood experiments. In this process Neville performs the role of scientist — yet simultaneously appoints himself as a 'controller,' capturing the infected, bringing them to his lab, and making them research subjects.

• Ethical Problems of Experimentation: Every experiment Neville conducts on the infected treats them more as 'research subjects' than as living beings with dignity. This is the most extreme example of how desperation for survival can break down scientific ethical awareness.
• Violence in the Name of 'Salvation': All of Neville's actions are packaged under the grand pretext of 'saving humanity,' yet in the process he commits the violent act of 'managing' and 'classifying' the infected. At this point, Neville stands on the boundary — not of hero, but of 'monster' who defers moral judgment for survival.

The Question at the Climax: Appeal and Fury

At the film's climax, the desperate final appeal Neville makes to the infected brings this thematic consciousness to its peak.

"You are sick and you can be healed. I can help you. I can save all of you."

These words show that Neville is still granting the infected the possibility of 'humanity.' He wants to believe they are not beasts caged by instinct but 'patients' who can recover through treatment. Yet the infected do not respond to rational appeal — they attack Neville with only primal, 'rage-filled' instinct. This collision symbolically shows that no matter how powerful scientific knowledge and reason (Neville) may be, they can be powerless before the primal survival instinct (the infected).

Ultimately the film does not give an answer as to who is the monster. Neville acts like a monster for survival, and the infected act like beasts faithful to instinct. It is precisely this ambiguity that is the source of the power to ceaselessly ask audiences what 'humanity' is and what value must not be sacrificed in the extreme circumstances of survival.