But, of course, as we learn from Abe’s (Jeff Daniels) instructions, Seth is not to be killed, as it would be too cataclysmic to future events. Maiming and scarring on the body is fine, just so long as there’s no death. So there is an importance in not trying to change the world too much in the past. The beauty of Looper’s usage of time travel is, under typical circumstances, people from the future are being sent back to the past, through tightly controlled circumstances and limited stipulations, to be disposed of before they even existed. In practice, it’s a perfect loop; unless, of course, a disgruntled set of Loopers want to change the future.