List the things that don't make sense
There's loads. Let's make a list:
1. In a universe where the time travel model is a loop (as opposed to alt timelines) the loop can't break, so Bruce Willis would never get to the execution point without a hood & untied.No new marks or memories could appear.
2. The people who set this up had lots of risk and no gain by sending loopers to be offed by their past selves instead of sending them to a looper who is NOT their past self.
3. [ignoring point 1 and assuming alt/rewritten timelines can exist in this universe] escaped Bruce Willis comes from a timeline where Emily Blunt doesn't get killed by a looper (maybe she gets killed in a completely unrelated event or doesn't get killed at all, since the rumour that the Rainmaker saw his mum get killed is already confirmed by the event with the woman he originally called mum) so preventing her death may prevent adult Cid from becoming MORE evil than he already is, but it won't prevent him from becoming as evil as he already is.