I got over 28 million results and it took 10 seconds.
https://www.google.com/search?q=is+catching+fire+violent&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:official&client=firefox-a
The Google algorhythms are notorious for reading in a childlike literal way. The heavy reaction to your search may have been fueled by searches using each of those words in different ways’ Catching as in receiving, Catching as in contagious, Catching as in Ca-Ching! Fire as in hot stuff, Fire as in job ending, Fire as in guns blazing, Fire as in verbal criticism.. You see what I mean? I’m just one who likes to play with words. Still, I suspect there really are a lot of comments flying about in reference to that new movie itself.