There are so many articles and essays on this topic. Just do a quick google for 'violent video games' and you'll come up with tons. My personal opinion is that violent video games DO in fact contribute to violent behaviour, but they do it in conjunction with heaps of other factors, like parenting, social status, mental and physical health, television shows and many more. The person playing them is probably the major influence on violent behaviour, and then you get into a whole new argument about if a person is defined by their experiences in life (still more factors coming into the argument) or if their 'soul' (for lack of a better word) is set from birth. 999 out of 1000 people (if not more) would probably use violent video games as escapism - doing what you can't do in real life, venting frustration and the like - or simple enjoyment, entertainment. The other person would see it as appropriate behaviour, majorly because of the stuff I mentioned earlier. They don't deserve this much flak from media. Focus on the big picture, not the tiny details.