Crunchy English said:
EDIT - just to back up that last point
http://arstechnica.com/old/content/2005/08/5205.ars
http://www.hfienberg.com/clips/vidgames.htm
http://www.videogamevoters.org/pages/games_violence/
This is just the first couple things that came up in a search engine.
To be fair there was one story claiming a tenuous link had been made, but it was based on a shaky new "brain monitoring" technology and was carried on MSNBC and Fox News. Which, you might note, are not scientifically viable options.
Actually, most of the studies referenced in your links don't disprove violence correlates with video games, but rather point out other positive effects of some genres, use ambiguous research variables, are editorials, or are non-numerical meta-analysis. The terms "aggression" and "violence" aren't really well defined in the psychological community, nor is there any one agreed upon test or psychometric measure for either term (most authors of research studies just make up their own tests and measures or augment outdated or lesser used measures). So really, you've got to take a handful of salt with any research study you read, from either position.
Not that I think that if you play a violent video game it turns a person into a serial killer, but to think that the media we consume has absolutely zero effects on us is very naive. There is plenty of literature to support the notion that children and youth who are exposed to violent media, television and music, have an increased chance or committing violent acts themselves, in the short and long-term. (Or simply looking at research about music and moods can give some interesting insight into the way media affects our thought processes.) Of course most of these studies (that I've read) occur in the inner city, where families and children traditionally have less support and pro-social resources in addition to frequent exposure to harmful behaviors and societal discord.
It isn't unreasonable to infer that violent media is a potential factor in violent acts. But at the same time, here and there you do read interesting studies that show the pro-social aspects of some music and media and what effects it has on the individuals studied. Not that human behavior is a simple teeter-totter and balance act, but I think most of us have an idea on how different media can alter our attitudes and behaviors. Most of us that have played violent video games from a wee age probably haven't gone out and committed violent acts because we've also had many pro-social experiences in our lives: good parents and extended family members, a helpful and supportive community, educational and affirming clubs (Boy Scouts, Girl Scouts, academic clubs, 4-H, community organizations, Boys & Girls club, etc.) affirming and positive religious/spiritual organizations, formal education, post-secondary education, etc.
An additional note, studies' definitions of violence can vary greatly, from violent thoughts, increased likelihood of aggressive provocation, increased usage of aggressive terminology in everyday speech, period of time before an individual displays physiological signs of anger, actual committing of violent acts, to local and state records of violent infractions or jail time spent. Often times reading a news story or the abstract isn't enough, you really have to go out and find the actual article (which yes, is often a pain in the ass unless you have University access).