Amusing Theism story

My sister is a Jehovah's witness, with children and a husband also in the faith. Recently I was going through my old stuff, and found a stack of comics from when I was a youth (Back when the dinosaurs were still roaming the earth...) and thought that my nephew might want to read them. So, I gave them to my sister, who immediately rejected the several dozen "Mad" magazines, but took my "Batman 'vs Judge Dredd" series. Is the message here that vigilantism, violence, and supernatural themes are all right but parody, comedy and humor is not?