Does Offensive Art Cause People to Be More Violent?

Does violent or offensive art cause people to be more violent and offensive, or does violence and offensive behavior lead to the production of violent and offensive art?

There started to be a strong argument being put forth that the violence and aggression in music like punk, heavy metal, and rap were making our kids more violent and helping to lead to rising crime rates. Which way does the causal connection run? Where do you see a false cause fallacy? To answer this question, read up on False Cause fallacies—post hoc ergo propter hoc (after this, therefore because of this) and cum hoc ergo propter hoc (with this, therefore because of this—sometimes called non-causa pro causa—not the cause taken for the cause).