There is, however, no credible scientific evidence to show that these types of images alone either shape or trigger violent behavior. The rest were shameless exercises in wishful thinking. One sharp reason for the lack of easy fit between entertainment imagery and violence is that the brain happens to also process all sorts of other cultural images, news, ideas and emotions. For example, there is some imagery in songs that is very abusive to women. This personally disturbs me, but I also recognize that children learn to abuse others by watching the behavior of their parents.
Alcohol plays a major role too.
He's a loser. Meanwhile, poverty and its accompanying despair in this country flourish and many people die needlessly because they don't have health care. This might make some disenfranchised people, both young and old, a tad angry. Any discussion worth having about violence, whether it has to do with children or adults, must go well beyond the preoccupation of the Violence and Sex Moralists. It's the culture, stupid.