These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Alternate Character Interpretation: The Rainmaker. Cid as a child decides that he wants to stop bad people and that killing a guy is as good a way as any to do it. Fast-forward thirty years and he has all the Loopers still alive sent back to be killed. This could be argued as a good thing for society because the assassins in the past aren't killing people anymore and their future selves who had escaped judgment up to that point get their karmic due.
On the other hand there are the mass murders he ordered, and several were innocent people.
It seems like he is destroying hospitals. Killing the future Loopers just seems to be his way of purging the ranks and if you want to get another Alternate Character Interpretation, possibly perpetuating his own Stable Time Loop, if he knows that Joe was a Looper and realised that he needed to send him back to make himself exist. But if he didn't know for certain who Joe was (or how he managed to escape), he decided to send them all back, just to be sure.
Or, alternatively, tried to prevent it... by inadvertently ensuring it would happen.
The Rainmaker was actually cleaning things up in the future - the news networks and word of mouth said it was bad and that "innocents" are dying because they were controlled by the very people who were trouble. The Loopers by extension were part of the problem.
The problem with "cleaning up" the Loopers is that the Loopers are only a symptom of the problem... murder and time travel. They're enablers but closing their contracts won't actually stop anyone from using time travel for murder. Just make it more difficult, and require endlessly sending back old Loopers as new ones are recruited in the past, creating a self-perpetuating problem if not another Stable Time Loop.
Hell Is That Noise: The high pitch screeching that occurs when Cid uses his powers. Everything else goes silent to emphasize this.
Jerkass Woobie: Kid Blue. Yeah, he's one of the bad guys, but just watch that scene where he's talking with Abe and saying he just wanted him to know he did good and try not to feel just a little sorry for him.