Doctor Manhattan - Wikipedia, the free encyclopedia:
After his transformation, Jon begins to experience time in a non-linear, "quantum" fashion, and it is implied that he is aware of and experiencing all the moments of his life simultaneously. Jon is not omniscient; he remains reliant on his intellect and sensory experience to reach conclusions, but his range of sensory data has been abruptly extended, in proportion to the lessening of his emotional capacities. This often leads him to arrive at conclusions greatly different from those available to normal humans. His already weak will (marked by his apparent submission to his father's career plans, whatever they might be) becomes sublimated further during this time. He increasingly has difficulty acting in what those around him consider the present moment, leading to many accusations and even the public perception that he is emotionless and uninterested in human affairs. For instance, he does nothing to prevent the assassination of President John F. Kennedy, even though he is aware it is going to happen as he meets the President. However, during the course of Watchmen he displays powerful emotion several times. His apparent lack of sentiment is more a matter of radically altered priorities, owing to a colossal, unbridgeable gap of perception between Jon and the rest of humanity.
He subscribes to a deterministic view of events (at one point remarking "We're all puppets, Laurie. I'm just a puppet who can see the strings."). Throughout most of Watchmen, Doctor Manhattan appears to exert an effort of choice, and his actions often seemed governed by a rigidly utilitarian code of ethics in which the correct course of action must be the one that benefits the most. In some sense, unlimited power has come at the cost of the total absence of responsibility, and his growing detachment, if not apathy, is juxtaposed with his apparent ability to do anything. During the period in which Doctor Manhattan is a crime-fighter (at the behest of the government), he states that the morality of such activities escapes him. From his radically altered perspective, almost all human concerns appear pointless and without obvious merit.