http://oi44.tinypic.com/2qxz6nt.jpg

Normally something like this would be pretty harmless. But my 6 year old cousin created this rather disturbing (IMO) scene. I'm incredibly worried because from what I've seen, ever since playing video games he's become increasingly more violent (due to his parents letting him play God of War), so it could just be a harmless recreation of a scene he saw ingame. I'm really debating whether to take this up with his parents, because normal 6 year olds don't create things like this. Should I confront his parents about it?