Plot with more holes than a colander

Rating: 6/10 (8 January 2013)

My enjoyment of this film was marred by its time travel plot holes.
Spoiler alert! Firstly, the whole premise of the film is flawed. Why would gangsters send people to be killed back in time only 30 years, surely it would be better to send them back to the time of the dinosaurs? Secondly, why send them back alive, why not shoot them first then send them back in time? Also, when they send the looper back in time to be killed, why on earth would you send them back to be killed by themselves in the past? That is just asking for trouble - send them back to be killed by someone else.
And when the young version of the main character carves a message for his future self in his arm, his future self only sees it at that exact moment - surely he would have had it carved in his arm for 30 years.
When he shoots himself at the end, his future self vanishes. That would mean that everything that had happened in the movie couldn't have happened, because he wouldn't have existed to come back in time, so his younger self wouldn't have shot himself.