I think there’s definitely more to it than that. To some degree it may desensitize someone, but having played my share of games with violence in them, I don’t think it necessarily makes one violent. According to what I’ve read in the article you quoted, I can see that people who already have an inclination to violence etc. will be more drawn to violent games. I know of many people who are into gaming since their youth, but have not been adversely affect by games such as Mortal Kombat, Call of Duty and GTA.