Kids play violent games, or are exposed to other types of violent media.
That violent media then becomes the definition of these kids' reality. Kids shoot their friends full of holes. That's what we're all trying to get people to understand, so here's my two cents on the matter. They're saying that as violent video games become more graphic, and hence more realistic, the line between the virtual and the real begins to blur. Of course, they say this while using Doom and Quake as their prime examples of realistic simulated violence.