The plot, you see, is dependent on the idea of time-travel. The film is mainly set in the near future when time travel has not yet been invented, but is only a few decades off. When it is invented, it's promptly banned, so is used only by criminal gangs who, when they want to exterminate someone, send them back in time so that assassins called 'loopers' can kill them off, leaving no evidence in the future they come from. They have that name because they are sometimes called upon to 'close the loop' by killing their future selves. And the plot concerns the dilemmas when young Joe, played by Joseph Gordon-Levitt, is expected to kill old Joe, played by Bruce Willis. All of which raises three questions:
One: Why on earth have the criminal gang bosses concocted anything so complicated and unreliable? Why don't they just kill off the victims themselves, then send the body back to the past to destroy the evidence? In any case, if technology is sufficiently advanced to have time-travel, then disposing of a dead body will surely be no problem without using time-travel.
Two: Why is young Joe being asked to kill old Joe? That seems to me to be asking for trouble. Surely any sensible gang boss would ask someone else to kill off old Joe, without running the risk of the assassin having an emotional attachment to the victim.
Three: At the end of the film, Joseph Gordon-Levitt realises that the only way he can stop old Joe committing a dastardly act is by killing himself, so that he doesn't grow up into old Joe. Which would surely have led to the following conversation:
Old Joe: "Hang on a moment. Just think what will happen if you kill yourself now."
Young Joe: "It will stop me growing up, thereby preventing you from doing what I fear you are about to."
Old Joe: "That's very simplistic of you. Just look a bit further into the implications."
Young Joe: "I see what you are getting at. You mean, if I kill me now, then it will change the future and you won't come back in time because you won't be there."
Old Joe: "So I won't be here and about to commit a vile act, and you won't have to kill yourself to stop me."
Young Jog: "So I won't have any reason to kill myself, so I won't kill myself, and I'll grow old and will be sent back in time for me to kill."
Old Joe: " but it's worse than that, because both of us are here now only because I came back in time and you chased me. Let's go and have a drink and talk it over."
Young Joe: "OK." And they walk off together into the sunset.
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