The MPAA as evil as it is doesn’t support bullying.
They’re just sticking by their rules as stupid as those may be. To compare the MPAA’s rating of The Hunger Games and Bully is ridiculous. They didn’t have either in mind when rating the other and they were not trying to promote child on child death/bullying nor are they attempting to silence those against it. 

The Hunger Games is not about kids killing each other for sport.

Bullying is not an epidemic. If anything it is decreasing simply because it is drifting towards virtual harassment and as any mildly intelligent person should know, that is not a real issue.