Given scene/plot descriptions from movies or TV shows, and given a specific question about the scene, summarize the question into a title

Q: This movie left me incredibly confused at the end. I don't know if I missed something or if they just legitimately never explained it. The entire movie felt like just some random action movie that hinted at this great idea backing it but never actually made it around to that idea. It does a great job at making you feel like everyone fears the Divergents, but never goes into the why part of it.  What is so bad about being a divergent and why are the Erudites so keen on eliminating them all? What real threat do they pose to civilization that makes them so dangerous? Was it just that they can't be mind-controlled or was there more to it than that?

A: So what is so bad about being a Divergent?
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Q: As we all know, the most exciting part of seeing a movie is the trailers of upcoming movies before the actual film (note, this is coming from an American point of view, I am uncertain if this occurs in theatres everywhere).  However, there doesn't seem to be much of a forethought given to what trailers are shown, besides making sure big movie trailers are shown before other big movies. For instance, the idea of seeing a Dark Knight Rises trailer before Avengers (two different production companies, let alone two rival comic book companies) doesn't seem to make much sense to me.  Is there a strict guideline trailers are released controlled by the MPAA or do the theatres have free run of what to show?

A: What factors go into determining what trailers are played before movies?
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Q: It is mentioned in The Hunger Games: Mockingjay that Katniss wanted to run away from District 12, she suggested this to Gale while next to the lake that Katniss's father used to go teach Katniss how to swim.   Why did Gale not comply with Katniss and take the opportunity to run off to avoid the Games?

A:
Why did Katniss and Gale not run away when they had the chance?
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