The results of the study are junk, p > 0.95

And that result is peer reviewed:

Although there's yet to be a study that conclusively proves a direct causal relationship between video game violence and real-life violence, psychologists are continuing to examine the effect violent media can have on children. A new study by Simmons College Communications Professor Edward T. Vieira, Jr., Ph.D. and published in the 2011 spring/summer edition of the Journal of Children and Media, notes that violent video game exposure can actually hinder a child's moral development.

... The research found that frequent exposure to violent video games can impact children's perception that some types of violence are acceptable. "The study also found that children who spend a great deal of time playing violent video games (as defined by the Entertainment Software Rating Board) have an increased likelihood of accepting all types of violence," reads the report. "The study confirmed that boys spend twice the amount of time playing violent video games as girls do, and highlighted the increased risk faced by boys who can become desensitized to violence because of frequent exposure to violent video play."

You mean that boys are more likely to gravitate to situations where there are aggressive contests?  Man, I never saw that coming, even with all that  million years of evolution on the African savanna.  I'm shocked.  Shocked!

"Certainly not every child who continues to play violent video games is going to go out and perpetrate a violent act, but the research suggests that children — particularly boys — who are frequently exposed to these violent games are absorbing a sanitized message of 'no consequences for violence' from this play behavior," said Vieira. "The concern arises when children are taking in this message and there is a convergence of other negative environmental factors at the same time, such as poor parental communication and unhealthy peer relationships." [all emphasis mine - Borepatch]

So let's see: there's no actual, you know, proof that violent video games cause kids to be violent (see the very first sentence in the article).  And there's lots of evidence that kids with violent role models (either in the home or in their peer groups) are, well, violent.

The problem, of course, is that communications professors will never get grants - or tenure - for studies showing that kids from violence-prone homes or communities are likely to be violent.  Probably this would be considered double-plus ungood in the Ivory Tower, anyway.  So quick, Robin, to the Junk-Sciencemobile!

Idiots.  But remember, a village in Texas is missing its idiot, or something.