system
Given the following post, respond as if you're commenting on Reddit:
human
[Looper] Why send the older Looper to be killed by their younger self, instead of sending an older Looper to a different, younger, looper.

In the film *Looper*, Loopers are individuals in the past who killed individuals sent from the future and are paid for their efforts. This payment comes in the form of silver bars.

However, when the Looper has been deemed to have his contract finished, is a threat, etc. their employer sends back the Looper's future self. When they kill this individual they find gold bars in lue of silver bars and know that they have killed themselves.

This backfires when the main character realizes what is happening and the rest of the film ensues.

Why in the hell would the employer send the older version of the Looper back to their younger self? Why not send back the older Looper to an unrelated Looper, pay that Looper in silver and then send someone to the younger version of the recently killed Looper and give him the gold bars. It would go as follows

* Looper A, in the future, has served his purpose and the employer wants him killed.

* Looper B, in the past, is sent yet another person with a bag over his head. He kills Looper A and takes his silver.

* Another individual arrives at the residence of Looper A and gives him bars of gold. 

This still gives Looper A his "bonus" for being killed but doesn't leave the security flaw that goes into being sent back to yourself. 

This plot-hole has bothered me to the point that I actually hate this film. It just seems so stupid and such a gaping flaw in the Looper system.
gpt
When a looper kills their future self they know they have about 30 years to live it up, at which point time travel is invented and the criminal organization ties all their loose ends.

If another looper were to execute you, you would have to live with that murderer for 30 years. While it might present less of an opportunity for you to try and cheat death, it also increases the likelihood you'll try to find your executor and exact revenge, or do something else that screws it all up.

Having loopers close the loops themselves helps minimize the effects of causality, and compartmentalizes operations. Each looper is a contained agent that erases the evidence of their existence. If loopers have to kill other loopers, you'll now have a web of interconnected agents, which is much easier for the police to sniff out. And if the whole web is exposed it will have huge repercussions for the past and may even result in major changes to the future.